Microsoft Graph Groups.conversation API

openapi: 3.1.0
info:
  title: Microsoft Graph Admin Admin.admin Groups.conversation API
  description: 'Microsoft Graph API for managing administrative resources in Microsoft Entra ID.

    This API enables administrators to manage Microsoft Edge browser settings, Internet Explorer mode configurations,

    site lists, shared browser sites, Microsoft 365 Apps installation options, people insights, service announcements,

    SharePoint settings, Copilot administration, directory administrative units, and admin consent policies.'
  version: 1.0.0
  contact:
    name: Microsoft Graph API Support
    url: https://developer.microsoft.com/graph
servers:
- url: https://graph.microsoft.com/v1.0
  description: Microsoft Graph API v1.0 endpoint
tags:
- name: Groups.conversation
paths:
  /groups/{group-id}/conversations:
    description: Provides operations to manage the conversations property of the microsoft.graph.group entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph List conversations
      description: Retrieve the list of conversations in this group.
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/group-list-conversations?view=graph-rest-1.0
      operationId: groups.ListConversations
      parameters:
      - $ref: '#/components/parameters/top'
      - $ref: '#/components/parameters/skip'
      - $ref: '#/components/parameters/search'
      - $ref: '#/components/parameters/filter'
      - $ref: '#/components/parameters/count'
      - name: $orderby
        in: query
        description: Order items by property values
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          $ref: '#/components/responses/microsoft.graph.conversationCollectionResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
    post:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Create conversation
      description: Use reply thread or reply post to further post to that conversation.
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/group-post-conversations?view=graph-rest-1.0
      operationId: groups.CreateConversations
      requestBody:
        description: New navigation property
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.conversation'
        required: true
      responses:
        2XX:
          description: Created navigation property.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.conversation'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}:
    description: Provides operations to manage the conversations property of the microsoft.graph.group entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get conversation
      description: Retrieve the properties and relationships of conversation object.
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/conversation-get?view=graph-rest-1.0
      operationId: groups.GetConversations
      parameters:
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.conversation'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
    delete:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Delete conversation
      description: Delete conversation.
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/conversation-delete?view=graph-rest-1.0
      operationId: groups.DeleteConversations
      parameters:
      - name: If-Match
        in: header
        description: ETag
        schema:
          type: string
      responses:
        '204':
          description: Success
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads:
    description: Provides operations to manage the threads property of the microsoft.graph.conversation entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph List threads
      description: 'Get all the threads in a group conversation. Note: You can also get all the threads of a group.'
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/conversation-list-threads?view=graph-rest-1.0
      operationId: groups.conversations.ListThreads
      parameters:
      - $ref: '#/components/parameters/top'
      - $ref: '#/components/parameters/skip'
      - $ref: '#/components/parameters/search'
      - $ref: '#/components/parameters/filter'
      - $ref: '#/components/parameters/count'
      - name: $orderby
        in: query
        description: Order items by property values
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          $ref: '#/components/responses/microsoft.graph.conversationThreadCollectionResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
    post:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Create thread
      description: "Create a new thread in the specified conversation.  A thread and post are created as specified. Use reply thread to further post \r\nto that thread. Or, if you get the post ID, you can also reply to that post in that thread. Note: You can also start a new conversation by first creating a thread."
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/conversation-post-threads?view=graph-rest-1.0
      operationId: groups.conversations.CreateThreads
      requestBody:
        description: New navigation property
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.conversationThread'
        required: true
      responses:
        2XX:
          description: Created navigation property.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.conversationThread'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}:
    description: Provides operations to manage the threads property of the microsoft.graph.conversation entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get threads from groups
      description: A collection of all the conversation threads in the conversation. A navigation property. Read-only. Nullable.
      operationId: groups.conversations.GetThreads
      parameters:
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.conversationThread'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
    patch:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Update the navigation property threads in groups
      operationId: groups.conversations.UpdateThreads
      requestBody:
        description: New navigation property values
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.conversationThread'
        required: true
      responses:
        2XX:
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.conversationThread'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
    delete:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Delete navigation property threads for groups
      operationId: groups.conversations.DeleteThreads
      parameters:
      - name: If-Match
        in: header
        description: ETag
        schema:
          type: string
      responses:
        '204':
          description: Success
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/reply:
    description: Provides operations to call the reply method.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    x-ms-docs-grouped-path:
    - /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/reply
    - /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/reply
    - /groups/{group-id}/threads/{conversationThread-id}/reply
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/reply
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/reply
    post:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Invoke action reply
      description: Create an open extension (openTypeExtension object) and add custom properties in a new or existing instance of a resource. You can create an open extension in a resource instance and store custom data to it all in the same operation, except for specific resources. The table in the Permissions section lists the resources that support open extensions.
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/opentypeextension-post-opentypeextension?view=graph-rest-1.0
      operationId: groups.group.conversations.conversation.threads.conversationThread.reply
      requestBody:
        description: Action parameters
        content:
          application/json:
            schema:
              type: object
              properties:
                Post:
                  $ref: '#/components/schemas/microsoft.graph.post'
        required: true
      responses:
        '204':
          description: Success
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: action
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts:
    description: Provides operations to manage the posts property of the microsoft.graph.conversationThread entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    x-ms-docs-grouped-path:
    - /groups/{group-id}/threads/{conversationThread-id}/posts
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get posts from groups
      operationId: groups.conversations.threads.ListPosts
      parameters:
      - $ref: '#/components/parameters/top'
      - $ref: '#/components/parameters/skip'
      - $ref: '#/components/parameters/search'
      - $ref: '#/components/parameters/filter'
      - $ref: '#/components/parameters/count'
      - name: $orderby
        in: query
        description: Order items by property values
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          $ref: '#/components/responses/microsoft.graph.postCollectionResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}:
    description: Provides operations to manage the posts property of the microsoft.graph.conversationThread entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    - name: post-id
      in: path
      description: The unique identifier of post
      required: true
      schema:
        type: string
      x-ms-docs-key-type: post
    x-ms-docs-grouped-path:
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get posts from groups
      operationId: groups.conversations.threads.GetPosts
      parameters:
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.post'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/attachments:
    description: Provides operations to manage the attachments property of the microsoft.graph.post entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    - name: post-id
      in: path
      description: The unique identifier of post
      required: true
      schema:
        type: string
      x-ms-docs-key-type: post
    x-ms-docs-grouped-path:
    - /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/attachments
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get attachments from groups
      description: Read-only. Nullable. Supports $expand.
      operationId: groups.conversations.threads.posts.ListAttachments
      parameters:
      - $ref: '#/components/parameters/top'
      - $ref: '#/components/parameters/skip'
      - $ref: '#/components/parameters/search'
      - $ref: '#/components/parameters/filter'
      - $ref: '#/components/parameters/count'
      - name: $orderby
        in: query
        description: Order items by property values
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          $ref: '#/components/responses/microsoft.graph.attachmentCollectionResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-pageable:
        nextLinkName: '@odata.nextLink'
        operationName: listMore
      x-ms-docs-operation-type: operation
    post:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Create new navigation property to attachments for groups
      operationId: groups.conversations.threads.posts.CreateAttachments
      requestBody:
        description: New navigation property
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/microsoft.graph.attachment'
        required: true
      responses:
        2XX:
          description: Created navigation property.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.attachment'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  ? /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/attachments/{attachment-id}
  : description: Provides operations to manage the attachments property of the microsoft.graph.post entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    - name: post-id
      in: path
      description: The unique identifier of post
      required: true
      schema:
        type: string
      x-ms-docs-key-type: post
    - name: attachment-id
      in: path
      description: The unique identifier of attachment
      required: true
      schema:
        type: string
      x-ms-docs-key-type: attachment
    x-ms-docs-grouped-path:
    - /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments/{attachment-id}
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/attachments/{attachment-id}
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments/{attachment-id}
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get attachments from groups
      description: Read-only. Nullable. Supports $expand.
      operationId: groups.conversations.threads.posts.GetAttachments
      parameters:
      - name: $select
        in: query
        description: Select properties to be returned
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      - name: $expand
        in: query
        description: Expand related entities
        style: form
        explode: false
        schema:
          uniqueItems: true
          type: array
          items:
            type: string
      responses:
        2XX:
          description: Retrieved navigation property
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/microsoft.graph.attachment'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
    delete:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Delete navigation property attachments for groups
      operationId: groups.conversations.threads.posts.DeleteAttachments
      parameters:
      - name: If-Match
        in: header
        description: ETag
        schema:
          type: string
      responses:
        '204':
          description: Success
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: operation
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/attachments/$count:
    description: Provides operations to count the resources in the collection.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    - name: post-id
      in: path
      description: The unique identifier of post
      required: true
      schema:
        type: string
      x-ms-docs-key-type: post
    get:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Get the number of the resource
      operationId: groups.conversations.threads.posts.attachments.GetCount-d70e
      parameters:
      - $ref: '#/components/parameters/search'
      - $ref: '#/components/parameters/filter'
      responses:
        2XX:
          $ref: '#/components/responses/ODataCountResponse'
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
  ? /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/attachments/createUploadSession
  : description: Provides operations to call the createUploadSession method.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
      in: path
      description: The unique identifier of conversation
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversation
    - name: conversationThread-id
      in: path
      description: The unique identifier of conversationThread
      required: true
      schema:
        type: string
      x-ms-docs-key-type: conversationThread
    - name: post-id
      in: path
      description: The unique identifier of post
      required: true
      schema:
        type: string
      x-ms-docs-key-type: post
    x-ms-docs-grouped-path:
    - /groups/{group-id}/calendar/events/{event-id}/attachments/createUploadSession
    - /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments/createUploadSession
    - /groups/{group-id}/events/{event-id}/attachments/createUploadSession
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/attachments/createUploadSession
    - /groups/{group-id}/threads/{conversationThread-id}/posts/{post-id}/inReplyTo/attachments/createUploadSession
    post:
      tags:
      - Groups.conversation
      summary: Microsoft Graph Invoke action createUploadSession
      description: 'Create an upload session that allows an app to iteratively upload ranges of a file, so as to attach the file to the specified Outlook item. The item can be a message or event. Use this approach to attach a file if the file size is between 3 MB and 150 MB. To attach a file that''s smaller than 3 MB, do a POST operation on the attachments navigation property of the Outlook item; see how to do this for a message or for an event. As part of the response, this action returns an upload URL that you can use in subsequent sequential PUT queries. Request headers for each PUT operation let you specify the exact range of bytes to be uploaded. This allows transfer to be resumed, in case the network connection is dropped during upload. The following are the steps to attach a file to an Outlook item using an upload session: See attach large files to Outlook messages or events for an example.'
      externalDocs:
        description: Find more info here
        url: https://learn.microsoft.com/graph/api/attachment-createuploadsession?view=graph-rest-1.0
      operationId: groups.group.conversations.conversation.threads.conversationThread.posts.post.attachments.createUploadSession
      requestBody:
        description: Action parameters
        content:
          application/json:
            schema:
              type: object
              properties:
                AttachmentItem:
                  $ref: '#/components/schemas/microsoft.graph.attachmentItem'
        required: true
      responses:
        2XX:
          description: Success
          content:
            application/json:
              schema:
                anyOf:
                - $ref: '#/components/schemas/microsoft.graph.uploadSession'
                - type: object
                  nullable: true
        4XX:
          $ref: '#/components/responses/error'
        5XX:
          $ref: '#/components/responses/error'
      x-ms-docs-operation-type: action
  /groups/{group-id}/conversations/{conversation-id}/threads/{conversationThread-id}/posts/{post-id}/extensions:
    description: Provides operations to manage the extensions property of the microsoft.graph.post entity.
    parameters:
    - name: group-id
      in: path
      description: The unique identifier of group
      required: true
      schema:
        type: string
      x-ms-docs-key-type: group
    - name: conversation-id
    

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# Full source: https://raw.githubusercontent.com/api-evangelist/microsoft-graph/refs/heads/main/openapi/microsoft-graph-groups-conversation-api-openapi.yml