Lost Notebook on iPad

I lost a notebook that I had been working on for a week and saving regularly, and I cannot locate the file anywhere.

Just prior to losing the file I received a Dead Kernel error several times in a row, and restarting the Kernel didn’t help. I closed the app and my notebook was gone. I cannot find it in my files and I used OS commands to explore the file directory where the new instance of Carnets is saving files, but the notebook isn’t anywhere in the directory. Any guidance would be much appreciated.