create
  fun Media.createMetadata(    mediaId: Long,     payload: JsonObject,     vararg options: Option): EmptyApiAction
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This endpoint can be used to provide additional information about the uploaded media_id. This feature is currently only supported for images and GIFs. The request flow should be:
- Upload media using either the simple upload endpoint or the (preferred) chunked upload endpoint. 
- Call this endpoint to attach additional metadata such as image alt text. 
- Create Tweet with media_id(s) attached. 
Receiver
Media endpoint instance.
Return
Parameters
options
Optional. Custom parameters of this request.