Cannot create backup to a WebDAV mounted folder: "Mode rw not supported by WebDAV"

[starmatt]

Checklist

• I am able to reproduce the bug with the latest version given here: CLICK THIS LINK.
• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.
• I have read and understood the AI policy. The content of this bug report is not generated by AI.

Affected version

0.28.2

Steps to reproduce the bug

1. Create a WebDAV mounted folder (I use DAVx5)
2. Open NewPipe settings
3. Go to Backup and Restore
4. Click on "Export database", and select the WebDAV mount.

(Same behaviour when trying to export subscriptions only)

Expected behavior

The NewPipe backup is successfully created in the mounted folder.

Actual behavior

• An exception is raised: java.lang.UnsupportedOperationException: Mode rw not supported by WebDAV
• And empty file is created in the mounted folder.

Screenshots/Screen recordings

No response

Logs

Exception

• User Action: database import or export
• Request: Exporting database and settings
• Content Country: US
• Content Language: en-
• App Language: en_US
• Service: <unknown_service>
• Timestamp: 2026-01-31T16:57:35.147+01:00
• Package: org.schabi.newpipe
• Service: <unknown_service>
• Version: 0.28.2
• OS: Linux Android 16 - 36

Crash log

java.lang.UnsupportedOperationException: Mode rw not supported by WebDAV
	at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:185)
	at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:164)
	at android.content.ContentProviderProxy.openAssetFile(ContentProviderNative.java:737)
	at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1878)
	at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1691)
	at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1637)
	at us.shandian.giga.io.FileStreamSAF.<init>(FileStreamSAF.java:32)
	at org.schabi.newpipe.streams.io.StoredFileHelper.getStream(StoredFileHelper.java:188)
	at org.schabi.newpipe.streams.io.StoredFileHelper.openAndTruncateStream(StoredFileHelper.java:193)
	at org.schabi.newpipe.settings.export.ImportExportManager.exportDatabase(ImportExportManager.kt:29)
	at org.schabi.newpipe.settings.BackupRestoreSettingsFragment.exportDatabase(BackupRestoreSettingsFragment.java:165)
	at org.schabi.newpipe.settings.BackupRestoreSettingsFragment.requestExportPathResult(BackupRestoreSettingsFragment.java:136)
	at org.schabi.newpipe.settings.BackupRestoreSettingsFragment.$r8$lambda$fGteoRaC9h1Pn2xEuX2RRkPtyno(BackupRestoreSettingsFragment.java:0)
	at org.schabi.newpipe.settings.BackupRestoreSettingsFragment$$ExternalSyntheticLambda1.onActivityResult(R8$$SyntheticClass:0)
	at androidx.activity.result.ActivityResultRegistry.doDispatch(ActivityResultRegistry.java:414)
	at androidx.activity.result.ActivityResultRegistry.dispatchResult(ActivityResultRegistry.java:371)
	at androidx.activity.ComponentActivity.onActivityResult(ComponentActivity.java:845)
	at androidx.fragment.app.FragmentActivity.onActivityResult(FragmentActivity.java:151)
	at android.app.Activity.onActivityResult(Activity.java:7626)
	at android.app.Activity.internalDispatchActivityResult(Activity.java:9546)
	at android.app.Activity.dispatchActivityResult(Activity.java:9523)
	at android.app.ActivityThread.deliverResults(ActivityThread.java:6173)
	at android.app.ActivityThread.handleSendResult(ActivityThread.java:6223)
	at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:78)
	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:63)
	at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem(TransactionExecutor.java:133)
	at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:103)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:80)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2823)
	at android.os.Handler.dispatchMessage(Handler.java:110)
	at android.os.Looper.loopOnce(Looper.java:248)
	at android.os.Looper.loop(Looper.java:338)
	at android.app.ActivityThread.main(ActivityThread.java:9067)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:593)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:932)

---

Affected Android/Custom ROM version

Android 16 / LineageOS 23.0

Affected device model

Sony Xperia 5 IV (XQ-CQ54)

Additional information

No response