My mom just received a Kindle Fire as a gift, the issue is that when she tried to download a PDF formated book from a site, it will not show up in her books. The file itself is not gone, we can go back on the web-viaKindle- and find it under "downloads"; the thing she is wondering is why we cannot see it in her books app area. Anyone have any ideas? I heard about something you have to download for a converter, however there has to be another way to go about this. Please answer soon.