Some mystery documents are stored in iCloud

I had the same experience about a month ago. I was going through my files getting ready for a presentation for my business and I noticed that someone had downloaded a book about how to sell a company overseas basically throwing me out of the business making them the owner and the book Was like a whole hacker Bible

I think the best thing to do is to take your device to an Apple Store. I’ll call them so they can walk you through the process, which is basically resetting it but you have to hurry because after they factory reset mines the same app and Files came back four hours later.

That’s likely just a system file for the folder.