Message file URL is incorrect

[994e586d]

In my messages, I click on numerous files and many return "Error 404 (BFG)" (Screenshot below).

The URL reports (e.g.):  https://www.upwork.com/ab/ab/messages/att/6dd94ffc-1eaa-47d9-bd6d-46fe510a298c?picture-outline=true

The URL has an extra "ab/" at the beginning. Removing an "ab/" allows me to download the file. It's not for all of the files in the message stream, but certainly most of them. Hovering over each file shows the correct URL link. Clicking on it sends me to the URL with the extra "ab/". Copying the link and placing it in the browser URL downloads the file correctly. This is frustrating and unnecessary.

I'm using the latest Chrome on Windows 64.