Still learning...while reading gmail, I opened an attached document, but I can't figure out how to close the document...it won't let me go back to reading my other emails. Also, when I looked for the manual I downloaded in my books, the only thing that comes up is a copy of that attachment from my email. I can't seem to locate any of the books on my bookshelf that I had before I updated the iOS. Any suggestions will be greatly appreciated.