Myself and an associate get this error when trying to load videos we have created in Adobe Express...
"Sorry, something went wrong during the file upload. Please try again in few minutes"
Chatted with Adobe Support who said they had no reports of this, but looking at other Help Community posts this has been going on for a while. Saying they reported to developers, but essentially if there is no ETA on a fix and you can't attach creations you made in Express to scheduled posts this is useless.
I know you can make creations, download them and re-upload them, but it's incredibly inefficient when other social media management tools just work. But I get AE Premium so I expect it should be working.
Try again later with no ETA is no solution.
To be helpful if we creata background image and text layers that CAN attach. If we do a simple background image with text already in it from Photoshop and animate that that CAN attach. But any background image with text layers in AE that animates FAILS to attach. And we are talking short, 5 second videos.