For Android tablets we would recommend the ReadEra or Kobo Reader apps which you can install on your device from the Google Play Store. Use the links provided or tap on the following links on your phone to be taken to the Google Play pages for these apps:
For a guide to Installing eBooks from SD cards or device memory on Android tablets see https://help.kobo.com/hc/en-us/articles/360017864893-Import-items-from-your-SD-card-to-the-Kobo-Books-app-for-Android
Once downloaded, you can either press on your eBook, and select your e-reader app to open it, or import the book to the app from inside your e-reader.0
NB The eBooks we have created are not suitable for viewing on Android Phones (of any screen size) and are designed for tablet only.