How do i get my files moved back?

Yesterday I opened up my Tablet to read one of my PDFs and it was missing. And all of the PDFs in that folder were missing. And as I went through my other folders, I found that most of my PDFs were gone. After spending most of my day looking for ways to get them restored, I found that Acrobat had all of the files. I'm not sure how Acrobat moved them. But I'm hoping they are all there. And I have completely lost any organization of the files.

I need to know how this happened and how to reverse it. I can't find any of my PDFs I want to read without a lot of time-wasting searching.

I had all of these files extensively organized.

I need them taken out of Acrobat and put back in their organized folders.

How does that get accomplished?