I ended up redownloading the file to continue reading it. But again, I wanted to continue with this file.
Fear not. You can easily get to your downloaded files rather easily. It does not seem to make complete sense to me why it is set up this way, but what you need to do is open the web browser, then click on the little bar of paper icon (that's the best that I can describe it) found on the bottom black bar. There you will find a link to your downloads, that you will be able to access, with out having to download that file every time you want to access it.