Unable to Submit Screenshots

Is anyone else facing this problem? For the last hour or so, I've been unable to submit new screenshots. We have an iPhone app update with Duo support ready to submit, but can't get the screenshots to upload. Every attempt results in "Your file couldn't be saved. Try again. If the issue persists, contact us."

I've even tried uploading my known, good screenshots from an already updated / approved Duo app with the same error, so it's not an issue with my specific screenshots.

I've tried private browsing, Chrome, Safari, logging out, etc. No luck. Anyone else seeing this?

Edit: Solved, sort of. Screenshots would not upload with a video header image set. Removed video header image, and screenshots upload again.

Same issue here. I'm unable to add screenshot for IAP right now - very frustrating and have wasted 30+ min already unable to get things added. Known working images just get stuck processing. Eventually it shows "Something went wrong. Delete the assets and try again." which doesn't work.