I have just spent over an hour on Nexus help without finding the answer to this simple question. (I haven't called Google, just using this: https://support.google.com/nexus/?hl=en#topic=3415518) I used a USB cable to transfer a down-loaded epub book from my computer to the Nexus. On my computer's graphic of the Nexus innards, it shows documents under internal storage, so that's where I put the book. But I can't find it on the Nexus itself. There are just a lot of apps and settings. There is a "download" section under the apps, where I can see and access some pdf files I put there this summer, so I added the epub there. While it shows up as being there when the Nexus is connected to the computer, as it does in the documents, it actually doesn't show up when I disconnect the Nexus from the computer and click on downloads. I wouldn't have been surprised if I couldn't actually read the book until I downloaded a new epub reader, although I hoped I might be able to use the Overdrive program which is already there. But I am surprised I actually can't find the file. I would really appreciate some help with this. TIA.