Closing this.

Starting from 8:15 AM UTC we received alerts about customers not being able to upload new assets in the media area of their project.

This issue only affected uploads made from the administrative area. Uploads performed via the JavaScript client were not impacted.

The issue was traced to a recent deploy. We identified and reverted the problematic changes at 9:20 AM UTC. The issue has been resolved and asset uploads are functioning normally.

We apologize for the inconvenience.