Without calling takePersistableUriPermission, the content:// URI
permission granted by ACTION_OPEN_DOCUMENT_TREE is revoked on
app reinstall, causing Permission Denial errors during sync.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Supports WebDAV, SFTP, SFTPGo, Nextcloud, ownCloud, Google Drive,
Dropbox, and OneDrive. Credentials encrypted with Android Keystore.
Biometric app-lock, conflict resolution, and auto-sync via WorkManager.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
amir