Add sound to Android system sound

I'm trying to add some mp3 files from assets folder to android system sounds notification.

My problems are:

1. To add sound from assets to system sound I needed to storage permission with following code:

   fun addSounds() {
       val file = File(requireContext().filesDir, "notifications")
       if (!file.exists())
           file.mkdirs()
       val soundFile = File(file.absolutePath + "/" + "longbeep.mp3")
       requireContext().assets.open("long_beep.mp3").use { input ->
           soundFile.outputStream().use { output ->
               input.copyTo(output, 1024)
           }
       }
       registerFile(soundFile, "ShahramLong2")
   }
   
   private fun registerFile(file: File, fileName: String) {
       val values = ContentValues()
       values.put(MediaStore.MediaColumns.DATA, file.getAbsolutePath());
       values.put(MediaStore.MediaColumns.TITLE, fileName);
       values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/ogg");
       values.put(MediaStore.MediaColumns.SIZE, file.length());
       values.put(MediaStore.Audio.Media.IS_RINGTONE, false);
       values.put(MediaStore.Audio.Media.IS_NOTIFICATION, true);
       values.put(MediaStore.Audio.Media.IS_ALARM, false);
       values.put(MediaStore.Audio.Media.IS_MUSIC, false);
       val generalaudiouri = Media.EXTERNAL_CONTENT_URI
   
       val uri = Media.getContentUriForPath(file.absolutePath)
   
       requireContext().contentResolver.delete(
           Media.EXTERNAL_CONTENT_URI,
           MediaStore.MediaColumns.DATA + "='" + file.getAbsolutePath() + "'",
           null
       )
       requireContext().contentResolver.insert(Media.EXTERNAL_CONTENT_URI, values)
   }
   

2. When changed registerFile to following code app crashed with exception

   Caused by: java.lang.UnsupportedOperationException: Writing to internal storage is not supported.
   at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:174)
   at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:142)
   

   Code is:

   private fun registerFile(file: File, fileName: String) {
       val values = ContentValues()
       values.put(MediaStore.MediaColumns.DATA, file.getAbsolutePath());
       values.put(MediaStore.MediaColumns.TITLE, fileName);
       values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/ogg");
       values.put(MediaStore.MediaColumns.SIZE, file.length());
       values.put(MediaStore.Audio.Media.IS_RINGTONE, false);
       values.put(MediaStore.Audio.Media.IS_NOTIFICATION, true);
       values.put(MediaStore.Audio.Media.IS_ALARM, false);
       values.put(MediaStore.Audio.Media.IS_MUSIC, false);
       val generalaudiouri = Media.EXTERNAL_CONTENT_URI
   
       val uri = Media.getContentUriForPath(file.absolutePath)
       // use uri instead of Media.EXTERNAL_CONTENT_URI
   
       requireContext().contentResolver.delete(
           uri!!,
           MediaStore.MediaColumns.DATA + "='" + file.getAbsolutePath() + "'",
           null
       )
       requireContext().contentResolver.insert(uri!!, values)
   }
   

3. Another problem is apparently this line does not work:

   requireContext().contentResolver.delete(
       Media.EXTERNAL_CONTENT_URI,
       MediaStore.MediaColumns.DATA + "='" + file.getAbsolutePath() + "'",
       null
   )
   

   The sound is added several times.