Ebook Formats Guide

Errors when open PDF file when use adobe reader.
Solutions: Don't use adobe reader.
For IOS: use PDF reader which provided by IOS
For PC: edge reader provided by Microsoft, or Foxit PDF reader.
Download URL: https://www.foxitsoftware.com/products/pdf-reader/

Epub format is for apple devices, it can read by using ibook app directly

Azw3, mobi are kindle format, it supported by kindle devices or the devices which able to install kindle app

Download link for Kindle App