App Crash or Exception when uploading backup to WebDAV mount and restoring on another device.

[OfficialMuffin]

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.

Affected version

0.28.0

Steps to reproduce the bug

1. Upload backup to a WebDAV mount via DAVx5.
2. On another device mounted to the same WebDAV mount location, restore backup within NewPipe
3. NewPipe should crash or raise exception.

Expected behavior

Can upload backups to WebDAV mount via DAVx5 and restore on another device that's mounted to the same WebDAV mount.

Actual behavior

Uploading to a WebDAV mount via DAVx5. Even if I save the backup to my local device and upload it manually works, but when importing backup from another device connected to the same WebDAV mount, it crashes NewPipe

Screenshots/Screen recordings

No response

Logs

Exception

• User Action: database import or export
• Request: Exporting database and settings
• Content Country: GB
• Content Language: en-GB
• App Language: en_GB
• Service: none
• Timestamp: 2025-09-01T22:49:18.146+01:00
• Package: org.schabi.newpipe
• Service: none
• Version: 0.28.0
• 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:1903)
	at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1716)
	at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1662)
	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:164)
	at org.schabi.newpipe.settings.BackupRestoreSettingsFragment.requestExportPathResult(BackupRestoreSettingsFragment.java:135)
	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:7679)
	at android.app.Activity.internalDispatchActivityResult(Activity.java:9599)
	at android.app.Activity.dispatchActivityResult(Activity.java:9576)
	at android.app.ActivityThread.deliverResults(ActivityThread.java:6207)
	at android.app.ActivityThread.handleSendResult(ActivityThread.java:6257)
	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$H.handleMessage(ActivityThread.java:2832)
	at android.os.Handler.dispatchMessage(Handler.java:110)
	at android.os.Looper.loopOnce(Looper.java:248)
	at android.os.Looper.loop(Looper.java:338)
	at android.app.ActivityThread.main(ActivityThread.java:9106)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:593)
	at com.android.internal.os.ExecInit.main(ExecInit.java:50)
	at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
	at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:371)

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Affected Android/Custom ROM version

GrapheneOS Build 2025081400

Affected device model

Pixel 6a & Pixel 8 Pro

Additional information

No response