Can't read mp3 files Android using Java

This is the MainActivity.java:

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;

import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Dexter.withContext(this)
                .withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
                .withListener(new PermissionListener() {
                    @Override
                    public void onPermissionGranted(PermissionGrantedResponse permissionGrantedResponse) {
                        ArrayList<File> songs = fetchSongs(Environment.getExternalStorageDirectory());
                        String[] items = new String [songs.size()];

                        for (int i = 0; i < songs.size(); i++) {
                            items[i] = songs.get(i).getName().replace(".mp3", "");
                        }

                        ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, items);
                        ListView listView = findViewById(R.id.listView);
                        listView.setAdapter(adapter);
                    }

                    @Override
                    public void onPermissionDenied(PermissionDeniedResponse permissionDeniedResponse) {}

                    @Override
                    public void onPermissionRationaleShouldBeShown(PermissionRequest permissionRequest, PermissionToken permissionToken) {
                        permissionToken.continuePermissionRequest();
                    }
                })
                .check();
    }

    public ArrayList<File> fetchSongs (File file) {
        ArrayList arrayList = new ArrayList();
        File [] songs = file.listFiles();

        if (songs != null) {
            for (File song : songs) {
                if (song.isDirectory() && !song.isHidden()) {
                    arrayList.addAll(fetchSongs(song));
                } else {
                    if (song.getName().endsWith(".mp3") && !song.getName().startsWith(".")) {
                        arrayList.add(song);
                    }
                }
            }
        }

        return arrayList;
    }
}

FYI I am running this on a Physical Device which has Android 10.

The 'file' parameter in public ArrayList<File> fetchSongs (File file) function is not null and is a Directory but in the same Function if I run file.listFiles() that returns null.

I do have two mp3 files downloaded.

My AndroidManifest.xml File has declared the permission to Read External Storage: <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

I don't know if this only works if you have if (if (songs != null)songs != null)an external SD card on your Device but I am running this on my Device's own Storage.

Edit: When I ran this on another Physical Device which had Android 9 It ran perfectly.

Any Help is much Appreciated. Thank You