Unable to export to NextCloud using SAF

Checklist

• I am using the latest version - 0.21.6
• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one bug. I will open one issue for every bug report I want to file.

Steps to reproduce the bug

1. Go to Export Database
2. Select Nextcloud menu in file.
3. Tap on SAVE button

Actual behavior

It throws the error text Sorry. Something went wrong. and stores a file with 0 byte size.

Expected behavior

The file should be exported to nextcloud.

Screenshots/Screen recordings

Logs

Exception

• User Action: ui error
• Request: Exporting database
• Content Country: IN
• Content Language: en
• App Language: en_US
• Service: none
• Version: 0.21.6
• OS: Linux Android 10 - 29

java.io.FileNotFoundException: Error downloading file: NewPipeData-20210715_122300.zip
 at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:149)
 at android.content.ContentProviderProxy.openAssetFile(ContentProviderNative.java:631)
 at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1521)
 at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1338)
 at android.content.ContentResolver.openFileDescriptor(ContentResolver.java:1286)
 at us.shandian.giga.io.FileStreamSAF.<init>(FileStreamSAF.java:32)
 at org.schabi.newpipe.streams.io.StoredFileHelper.getStream(StoredFileHelper.java:190)
 at org.schabi.newpipe.settings.ContentSettingsManager.exportDatabase(ContentSettingsManager.kt:24)
 at org.schabi.newpipe.settings.ContentSettingsFragment.exportDatabase(ContentSettingsFragment.java:200)
 at org.schabi.newpipe.settings.ContentSettingsFragment.requestExportPathResult(ContentSettingsFragment.java:170)
 at org.schabi.newpipe.settings.ContentSettingsFragment.lambda$8bBkxkdGnhK6YvPK6sE5N6ky1yA(Unknown Source:0)
 at org.schabi.newpipe.settings.-$$Lambda$ContentSettingsFragment$8bBkxkdGnhK6YvPK6sE5N6ky1yA.onActivityResult(Unknown Source:4)
 at androidx.activity.result.ActivityResultRegistry$1.onStateChanged(ActivityResultRegistry.java:148)
 at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.java:354)
 at androidx.lifecycle.LifecycleRegistry.forwardPass(LifecycleRegistry.java:265)
 at androidx.lifecycle.LifecycleRegistry.sync(LifecycleRegistry.java:307)
 at androidx.lifecycle.LifecycleRegistry.moveToState(LifecycleRegistry.java:148)
 at androidx.lifecycle.LifecycleRegistry.handleLifecycleEvent(LifecycleRegistry.java:134)
 at androidx.fragment.app.Fragment.performStart(Fragment.java:3026)
 at androidx.fragment.app.FragmentStateManager.start(FragmentStateManager.java:589)
 at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:300)
 at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:112)
 at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1647)
 at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3128)
 at androidx.fragment.app.FragmentManager.dispatchStart(FragmentManager.java:3079)
 at androidx.fragment.app.FragmentController.dispatchStart(FragmentController.java:262)
 at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:510)
 at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:210)
 at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1432)
 at android.app.Activity.performStart(Activity.java:7848)
 at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3295)
 at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
 at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
 at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
 at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2017)
 at android.os.Handler.dispatchMessage(Handler.java:107)
 at android.os.Looper.loop(Looper.java:214)
 at android.app.ActivityThread.main(ActivityThread.java:7397)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:935)

Device info

• Android version/Custom ROM version: android 10-29
• Device model: Redmi Note 5 Pro(Whyred)