Error uploading in app purchase screenshots for App Review

I'm getting a "There was an error uploading your screenshot. Try again later." error when trying to upload a screenshot under Review Information.

Tried both Safari / Chrome, JPG/PNG and screenshot size is correct.

Looking at the network logs, it is also returning a 409 Conflict error. Is there a known issue?

Error uploading in app purchase screenshots for App Review
 
 
Q