DocumentsContract.copyDocument - file

Question

I have a problem with DocumentsContract.copyDocument
Each time my program crashes: "java.lang.UnsupportedOperationException: Copy not supported"
The curious thing is the below-listed actions are working fine!!
DocumentsContract.moveDocument
DocumentsContract.deleteDocument
DocumentsContract.renameDocument
DocumentsContract.createDocument
Permission to SD card access is apparently granted (above actions would fail without permission)
How come document moving, deleting and renaming is supported but not copying?
Can anyone help me with this issue?
Is there a great conceptual difference between copyDocument and moveDocument. Why move does work and copy does not?
Any hint will be highly appreciated
package com.example.forum14_11_2020;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.documentfile.provider.DocumentFile;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.UriPermission;
import android.net.Uri;
import android.os.Bundle;
import android.os.storage.StorageManager;
import android.os.storage.StorageVolume;
import android.provider.DocumentsContract;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Uri uri;
DocumentFile pickedDir;
Button Button1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button1 = new Button(MainActivity.this);
Button1 = findViewById(R.id.button1);
Button1.setOnClickListener(onClickListener_Button1);
takeCardUriPermission("storage/1619-0D07");
}
View.OnClickListener onClickListener_Button1 = new View.OnClickListener() {
#Override
public void onClick(View v) {
uri = getUri();
pickedDir = DocumentFile.fromTreeUri(getBaseContext(), uri);
DocumentFile file = pickedDir.findFile("attempt.txt");
DocumentFile folder = pickedDir.findFile("folder");
try {
//DocumentsContract.moveDocument(getContentResolver(), file.getUri(), folder.getUri(), folder.getUri()); // does work!
//DocumentsContract.deleteDocument(getContentResolver(), file.getUri()); // does work!
//DocumentsContract.renameDocument(getContentResolver(), file.getUri(), file.getName() + "_rename"); // does work!
DocumentsContract.copyDocument(getContentResolver(), file.getUri(), folder.getUri()); // does not work
} catch (UnsupportedOperationException | FileNotFoundException e) {
e.printStackTrace();
e.getMessage();
}
}
};
public void takeCardUriPermission(String sdCardRootPath) {
int stop=1;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
File sdCard = new File(sdCardRootPath);
StorageManager storageManager = (StorageManager) getSystemService(Context.STORAGE_SERVICE);
StorageVolume storageVolume = storageManager.getStorageVolume(sdCard);
Intent intent = storageVolume.createAccessIntent(null);
try {
startActivityForResult(intent, 4010);
} catch (ActivityNotFoundException e) {
}
}
}
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 4010) {
Uri uri = data.getData();
grantUriPermission(getPackageName(), uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
Intent.FLAG_GRANT_READ_URI_PERMISSION);
final int takeFlags = data.getFlags() & (Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
Intent.FLAG_GRANT_READ_URI_PERMISSION);
getContentResolver().takePersistableUriPermission(uri, takeFlags);
}
}
public Uri getUri() {
List<UriPermission> persistedUriPermissions = getContentResolver().getPersistedUriPermissions();
if (persistedUriPermissions.size() > 0) {
UriPermission uriPermission = persistedUriPermissions.get(0);
return uriPermission.getUri();
}
return null;
}
}