They were onenote's files, research notes. Had problems with sync and lost files.
How can I recover the files in the safest way? It happened today. I already stopped using the phone.
(asking for a friend)
Recovering deleted files android 6.0.1 (internal storage)
Question
Answer
I'd try photorec (testdisk package) in Linux. Or the Piraform file recovery program in Windows. Get it connected to a PC sooner rather than later as you don't want the area it was stored to be overwritten.
Was the Onenote not syncing with a Microsoft account?
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