INIT command request is used to initiate a file upload session.
It returns a
media_id which should be used to execute all subsequent
requests. The next step after a successful return from INIT command is
the APPEND command.
See the Uploading media guide for constraints and requirements on media files.
Requests should be either
application/x-www-form-urlencoded POST formats.
Note: The domain for this endpoint is upload.twitter.com
The response provides a media identifier in the
media_id_string (string) fields. Use the
other languages that cannot accurately represent a long integer.
The entire file must be uploaded before
additional_owners field enables media to be uploaded media as
user A and then used to create Tweets as user B.