Pop-ups not appearing on Android in Unity, how to fix?

Question

Android

I'm making a game in Unity and I need access to the files, but as you know, I have to get permission to do so. I'm trying to request it from the user through the code, but the pop-up window with the request (these often pop up in various android applications) simply does not appear.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Android;

public class Perm : MonoBehaviour
{
    readonly string[] _permissions = {Permission.ExternalStorageRead, Permission.ExternalStorageWrite};

    // Start is called before the first frame update
    void Awake()
    {
#if UNITY_ANDROID
        Permission.RequestUserPermission(Permission.ExternalStorageRead);
#endif
        RequestPermission();
        StartCoroutine(FckIt());
    }

    public void RequestPermission()
    {
        if (!Permission.HasUserAuthorizedPermission(Permission.ExternalStorageRead))
            Permission.RequestUserPermissions(_permissions);
    }

    IEnumerator FckIt()
    {
        yield return new WaitForSeconds(10f);
        RequestPermission();
    }
}

Here you can see that the code repeats itself several times. These are my attempts to fix the code myself, but nothing helps. I studied the documentation in this question and repeated the material of several articles exactly, but nothing has changed. What could be the problem?

Answer 1

After a long search, I found a solution. In order to solve this problem, you need to register all the necessary permissions in the AndroidManifest.xml file. Then at the start there will be a request, and a proposal will appear to allow the use of files