Many applications are not able to POST to upload.twitter.com/1/statuses/update_with_media due to a Twitter API bug.
Engineers are working to resolve the issue, and we're estimating that this will be resolved on May 8th, 2012.
Updates
- If you've encountered this issue, please add your application's ID/consumer key (not the secret, please) to Sudden: Client application is not authorized to access this endpoint.. We'll work to get this resolved as soon as we can.
- 2012-05-08 2:45PM PDT This issue should now be resolved; please let us know in the above thread if you're still getting a 403 "Client application is not authorized to access this endpoint" error when attempting to upload with media.