On the Google Play store is an app called "Nexus Media Importer". Get an OTG (on the go) USB cable, put video or book files on a USB flash drive - and suddenly you can just plug in a flash drive into the cable and watch movies, play music or ... copy epub and other files from the flash drive to the internal storage.
When my Nexus 7 OS upgraded, the app stopped working. So I used my gmail account to upload files to Drive, then downloaded the files into a Books folder from the gmail app on the Nexus 7.
The Nexus Media Importer recently updated so I suspect the author fixed the problem. But I have about 200 books I need to get through before I need to re-load.
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