Changes to Update file metadata or replace its file

added ExternalMetadataResponse subschema #2 to the external_metadata response property oneOf list for the response status 200

added the new optional request property file (media type: multipart/form-data)

added the new optional request property file (media type: application/x-www-form-urlencoded)

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 404

added the non-success response with the status 403

added the non-success response with the status 422

added the non-success response with the status 503

removed ExternalMetadataResponse from the external_metadata response property allOf list for the response status 200

added the required property pending_reprocess to the response with the 200 status

added the required property thumbnail to the response with the 200 status