Why is db not migrated from streamingAssets to persistentData on Android games (Unity)?

Question

Unity

I'm trying to use the sqlite database in the game.
On my android, the game works fine, although I struggled for a long time to unload it from Streaming Assets to Persit persistentDataPath. Released it on Google play. A friend downloaded it, but his base from Streaming Assets was not transferred to Persit persistentDataPath.

if (Application.platform == RuntimePlatform.Android)
        {
            
            _path = Get_path();
            if (!File.Exists(_path))
            {
                var loadingRequest = UnityWebRequest.Get(Path.Combine(Application.streamingAssetsPath, "RM_db_test.bytes"));
                loadingRequest.SendWebRequest();
                while (!loadingRequest.isDone) { }

                File.WriteAllBytes(Path.Combine(Application.persistentDataPath, "RM_db_test.bytes"), loadingRequest.downloadHandler.data);
            }



        }
        else if (Application.platform == RuntimePlatform.IPhonePlayer)
        {
            
            _path = Get_path();

            if (!File.Exists(_path))
            {
                _path = Application.streamingAssetsPath + "/RM_db_test.bytes";

                File.Copy(_path, Application.persistentDataPath + "/RM_db_test.bytes");

            }

What could be the problem?