Fix Android arcade emulator storage and folder permission problems
Create a dedicated accessible folder, reselect it with the Android system picker, and let the app persist the scoped URI grant if supported. If a provider or SD card changed the folder identity, remove the stale library entry and grant the new folder; do not solve it with all-files access.
Do this in order
- 01
Confirm the files still exist using Android’s trusted Files interface.
- 02
Check whether the game folder was moved, renamed, restored, or placed on another SD card.
- 03
Remove only the emulator’s stale folder entry; do not delete the source files.
- 04
Use the system picker to select a dedicated allowed folder again.
- 05
Rerun the library scan and inspect its first file-level error.
- 06
Revoke unused old grants in system settings after the new folder is verified.
Decision and diagnostic table
| Symptom | Cause to test | Safe action |
|---|---|---|
| Folder visible but disabled | Android blocks that root | Choose a dedicated child folder |
| Worked before reboot/update | Persisted URI grant missing or changed | Reselect folder through system picker |
| SD library disappeared | Card/provider identity changed | Mount card, then grant its current folder |
| Scan finds zero files | Unsupported provider, nested layout, or filter | Test one known file in a local dedicated folder |
A URI grant is not a filesystem path
Storage Access Framework providers expose documents through stable-looking identifiers, but moving content, replacing an SD card, or restoring from backup can invalidate the old grant. A text path copied from a desktop may not describe what Android granted.
Reselect the folder through the same app flow so Android can issue a current scoped permission.
Avoid storage roots
Android 11 prevents directory grants for several broad or sensitive locations. Put the library in a named child folder that contains only content the emulator should read.
This also makes backup, checksum verification, and permission revocation easier than granting an entire volume.
Separate discovery from compatibility
When a scan finds the archive but the game fails, storage permission is no longer the leading hypothesis. Move to the version-matched ROM, BIOS, parent, and CHD audit.
When the scan finds nothing, test with one small authorized archive and capture the provider and filename rather than changing emulation settings.
Folder access should be limited to files you are entitled to use. Never grant a third-party emulator access to private documents or unrelated backups.