To ensure the best reading experience, aim for these formats:

Open on your PC and navigate to the Phone > Documents or Phone > Downloads folder. Copy and paste your book files into these folders.

Select a compatible reader app (like Bookviser) to open and save the book to your local library. 3. Direct Transfer via USB

If you have a large collection of files on your computer, you can transfer them directly: Connect your Lumia to your PC using a micro-USB cable.