properties/update

[properties/update](https://www.dropbox.com/developers/documentation/http/documentation#file_properties-properties-update) scope: `files.metadata.write` Add, update or remove properties associated with the supplied file and templates. This endpoint should be used instead of `properties/overwrite` when property groups are being updated via a "delta" instead of via a "snapshot" . In other words, this endpoint will not delete any omitted fields from a property group, whereas `properties/overwr...