Update: Back up process completed after the latest update and an hour later.
I deleted the app and reinstalled.
the 102 gb occupied by the app freed up.
hopefully my backed up projects will load again....
Is the drawing a complex one? Sometimes syncing completely requires leaving the app open over wifi for a few minutes. Log in with your Adobe ID to Adobe Creative Cloud and see what version of the Sketch project you see on your device is there.
Let me know what you find.
Drawings loaded back again after full back up and reinstallation.
hopefully it doesn't happen again.
Perhaps an app bug is causing the physical storage issues on iPads.
Great. Happy to hear it. We're not sure; we've heard of it happening only four times (twice in Draw and twice in Sketch) and haven't been able to duplicate it during testing.