Kindle e-readers use their own proprietary Amazon format to display e-books, AZW3, which keeps most users from loading up a bunch of copyright-free books in the most common ePub format.

Google Docs, Sheets, and Slides apps for Android get Page setup and ODF/EPUB support. By Corbin Davenport. Published Jan 5, 2017. ... First up, Page setup is finally in the mobile Google Docs app.