Hi. Since updating the operating system to 7.0.4 my PDF files disappeared from my PDF folder. I had quite a few PDF files all organized in the PDF folder under Collections. After the update, they all disappeared - every file gone. But when I go to the search in "Books" and type in the heading of a PDF it comes up and I could read it. And when I close it - I have no idea where it goes to. Obviously the PDF files are somewhere in the ipad - but where. I would like to put them all back into the ibooks PDF folder, but I don't know where they are in order to move them. Any help would be appreciated. Thank you WhatI did so far was uninstall ibooks and reinstalled it, but nothing changed.