Moon+ Reader Pro Google Drive Sync Not Working? Fixes & Alternatives

Google Drive sync may not work in some Moon+ Reader Pro MOD APK builds. The reason is not always the reader itself. Google login can be blocked when Play Services checks fail, the app signature is changed, or Drive authorization refuses a modified client.

If Drive sync is a must, use the official Play Store version. If you stay on a MOD APK, skip to the backup alternatives below and use Dropbox, WebDAV, or a local backup workflow instead.

Recent Android versions handle Google Drive access more strictly than older phones. If you need Google Drive sync, use the official Moon+ Reader Pro version from Google Play first, then reconnect Drive cleanly:

1. Install or update the official Moon+ Reader Pro version from Google Play. Modified APK builds may fail Google sign-in, Play Services checks, or Drive authorization.
2. Open Android Settings and confirm Google Play Services is enabled.
3. In Moon+ Reader Pro, disconnect the old Google Drive account if the option is available.
4. Restart the app, then sign in to Google Drive again.
5. Accept the Drive permission prompt instead of backing out halfway.

If the login window closes instantly or loops back to the same screen, you are probably dealing with an authorization problem, not a reading-position problem.

Google Drive sync can break when the wrong account is selected or the previous permission was denied. On Android, also check whether the reader can access local folders before it tries to back anything up.

• Same account: use the same Google account on every device you expect to sync.
• Drive access: open your Google account security settings and remove old Moon+ Reader access, then reconnect from the app.
• Storage access: allow file/media permissions if your books are stored under Downloads, Documents, or an SD card.
• Network: temporarily disable Private DNS, firewall apps, VPN, or ad blockers while testing sign-in.

Do the test on stable Wi-Fi first. Public networks, school Wi-Fi, and work firewalls often block Google authorization pages in quiet ways.

One common misunderstanding: cloud sync does not always mean every book file is copied to every device. Depending on your setup, Moon+ Reader Pro may sync reading positions, bookmarks, annotations, or app settings while your EPUB and PDF files still need to exist locally.

For fewer surprises, keep your library in a simple folder such as Books/EPUB and copy that folder yourself when setting up a new phone. If EPUB files fail to open after transfer, use our Moon+ Reader EPUB troubleshooting guide before blaming sync.

If Google Drive sign-in works but your phone and tablet still open to different pages, check the basics before reinstalling:

• Open the same book file on both devices, not two edited copies with different filenames or metadata.
• Close the book on device A, wait a moment, then open it on device B.
• Check whether battery saver or background restrictions are blocking Moon+ Reader Pro from finishing the upload.
• Do not switch between multiple Google accounts while testing.

Small differences in file structure can make sync look broken. For best results, copy the same EPUB or PDF file to both devices first, then test reading position sync.

When Google Drive keeps failing, do not spend an hour repeating the same login screen. Use another backup route:

• Dropbox: easier than Google Drive on some devices, but free storage limits may matter for large PDF libraries.
• WebDAV: a good option if you already use Nextcloud, NAS storage, or a personal server.
• Local backup: safest for MOD APK users because it does not depend on Google account authorization.

For local backup, export settings if the app offers it, then copy your book folder and any Moon+ backup folder to another device or cloud storage manually.

Clearing app data can remove local settings, catalog records, and unsynced reading progress. Before doing it, copy your book folders, export app settings if possible, and write down which sync method you were using. Reinstalling should be the last step, not the first fix.