notability file lost

I lost a single file during a notability’s crash. I was multitasking 3 files, one of them had an iCloud loading icon froze during my last editing on that file. It isn’t backup to my google drive, andcannot be found since then. Not in the trashcan in notability or iCloud Drive, while the other 2 file(much smaller size) stay where they should be. I can only assume it kind of disappeared when notability tries to sync with iCloud or some steps were interrupted when I swiped away the frozen notability app

To this time I’ve tried to restart my iPad and also reset it to my last iCloud backup but the file still did not come back. Also, after the reset, some notes established after my last iCloud backup still can be found, I’m curious if there’s a way to reset everything back to the time my file still exist.