Guys, got a solution to whoever still have this issue: Create a new archive (with a new build version), and distribute it - but this time, remove the check from the "Upload your app's symbols to receive symbolicated reports from Apple". I can confirm this works for me, app is now being processed. Thanks to Martin Parker for the tip!

Same issue here. An almost identical binary was successfully processed yesterday morning (Jan 13th), but now (Jan 14th) I'm getting this weird "ITMS-90000: This bundle is invalid: $message" alert. As it happens to lots of people since yesterday, that seems like an issue on Apple's side - hope they would resolve it quickly so we can push in new versions to the App Store.

Same thing here. I recently wanted to re-edit an important video project I didn't touch for the past 6 months, and it's now zero bytes! This made me sniff around my iCould files and to my surprise lots of them suffer the same illness!! That's totally unreliable!! Can anyone at Apple check this? Otherwise, what's the point in iCloud files if they can vanish without notice??