Troubleshooting a that isn't opening your files.
: If the OneDrive app still functions on your build, upload books from your computer to the cloud and then "make available offline" on your Windows Phone. Recommended Reading Applications
: The most reliable method is connecting your phone to a PC via USB. Move your ebook files (EPUB, PDF, or FB2) directly into the "Documents" or "Downloads" folder on the device.
Because Windows Phone is a legacy platform, many modern "protected" ebooks (DRM-encrypted) from major retailers like Amazon or Kobo may not open. Stick to files for the best experience. If you’d like, I can help you by: Finding direct links to sites with free FB2 or EPUB books.
: A versatile open-source reader that handles various ebook formats efficiently.