How to open .epub file
On Android using Google Play Books:
Download the .epub file to your device (e.g., from an email, website, or cloud storage).
Open the Google Play Books app (download it from the Play Store if you don’t have it).
Tap the Menu icon (three horizontal lines) in the top-left corner.
Select Upload files.
Navigate to the location of the .epub file (e.g., Downloads or Files app).
Select the .epub file and tap Open or Upload.
The book will appear in your Google Play Books library. Tap it to start reading.
On iOS using iBooks / Apple Books:
Download the .epub file to your device (e.g., from an email, website, or cloud storage).
Tap the .epub file in the download location (e.g., Safari Downloads or Files app).
The file will automatically open in Apple Books (formerly iBooks).
If it doesn’t open automatically, tap the Share icon (square with an arrow) and select Books.
The book will appear in your Apple Books library. Tap it to start reading.