models shared True
# content_media_type_bytes in-process sync, in-process async
upload binary image
  > POST /uploads [multipart/form-data; boundary=<boundary>]
  upload(body=UploadsPostRequest(image=b'\x89PNG\xff\x00', encoded='aGk='))
  < 204 -
  = None
upload UTF-8 image
  > POST /uploads [multipart/form-data; boundary=<boundary>]
  upload(body=UploadsPostRequest(image=b'PNG', encoded='aGk='))
  < 204 -
  = None
