Can't copy file in ANDROID 11 Kotlin

Question

I have a stupid bug in my app.

I can copy contents of a folder from a folder like Downloads to root of my app in android, data,...

But

I can not copy contents of a folder from root of my app in android, data,... to a folder like Downloads

My code(that does work in android 11):

var this_dir = File("/storage/emulated/0/Download/Sandoghcheh")
var target_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
copyFolder(this_dir, target_dir)

My code(that does not work in android 11):

var this_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
var target_dir = File("/storage/emulated/0/Download/Sandoghcheh")
copyFolder(this_dir, target_dir)

permisions:

<uses-permission 
  android:name="android.permission.WRITE_SETTINGS" />

<uses-permission 
 android:name="android.permission.READ_EXTERNAL_STORAGE" />

<uses-permission
 android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    android:maxSdkVersion="31" />

 <uses-permission 
 android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

fun:

  fun copyFolder(source: File, destination: File) {
    if (source.isDirectory) {
        if (!destination.exists()) {
            destination.mkdirs()
        }
        val files = source.list()
        for (file in files) {
            val srcFile = File(source, file)
            val destFile = File(destination, file)
            copyFolder(srcFile, destFile)
        }
    } else {
        var `in`: InputStream? = null
        var out: OutputStream? = null
        try {
            `in` = FileInputStream(source)
            out = FileOutputStream(destination)
            val buffer = ByteArray(1024)
            var length: Int
            while (`in`.read(buffer).also { length = it } > 0) {
                out.write(buffer, 0, length)
            }
        } catch (e: Exception) {
            try {
                if (`in` != null) {
                    `in`.close()
                }
            } catch (e1: IOException) {
                e1.printStackTrace()
            }
            try {
                if (out != null) {
                    out.close()
                }
            } catch (e1: IOException) {
                e1.printStackTrace()
            }
        }
    }
}

reatore fun:

  private fun restore() {
    if (Build.VERSION.SDK_INT < 30) {
        createDirectory("backup")
        val file =   File("/storage/emulated/0/Download/Sandoghcheh")
        val target_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
        copyFolder(target_dir,file )

    } else {

         val file =   File("/storage/emulated/0/Download/Sandoghcheh")
        val target_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
        copyFolder(file, target_dir)
    }

    activity?.let {
        RoomBackup()
            .customRestoreDialogTitle("یکی از بشتیبان ها را انتخاب کنید")
            .context(it)
            .database(UserDatabase.getInstance(it))
            .enableLogDebug(true)
            .backupIsEncrypted(true)
            .customEncryptPassword("Amir")
            .useExternalStorage(true)
            .apply {
                onCompleteListener { success, message ->
                    Log.d("TAG", "success: $success, message: $message")
                    if (success) restartApp(Intent(context, SplashActivity::class.java))
                }
            }
            .restore()
    }
}

backup fun:

      private fun backup() {
      context?.let {
          RoomBackup()
              .context(it)
              .database(UserDatabase.getInstance(it))
              .enableLogDebug(true)
              .backupIsEncrypted(true)
              .customEncryptPassword("Amir")
              .useExternalStorage(true)
              .maxFileCount(5)
              .apply {
                  onCompleteListener { success, message ->
                  }
              }
              .backup()
      }
          if (Build.VERSION.SDK_INT < 30) {
            if (ContextCompat.checkSelfPermission(
                    requireActivity(),
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
                ) == PackageManager.PERMISSION_GRANTED
            ) {
                var this_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
                var target_dir = File("/storage/emulated/0/Download/Sandoghcheh")
                copyFolder(this_dir, target_dir)
            } else {
                askPermission()
            }
            var this_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
            var target_dir =
                File("/storage/emulated/0/Sandoghcheh")
            copyFolder(this_dir, target_dir)

        } else {
            val download_folder =
                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
            var this_dir = File(requireActivity().getExternalFilesDir(null), "/backup")
            var target_dir =download_folder
            copyFolder(target_dir, this_dir)
            Log.d("TAG", "backup: $download_folder,,$this_dir")


            //                 restartApp()

    }

}

and last but not the least: when I get this_dir and target_dir path it show me:

2022-01-21 13:41:07.938 23449-23449/com.example.holyquran D/TAG: backup: /storage/emulated/0/Download  ||||  /storage/emulated/0/Android/data/com.example.holyquran/files/backup

Restore FUN WORKS PERFECT, IT COPIES BUT BACK UP FUN DOES NOT COPY

as I said this code is not working in API +30

TNX for spending time on this Q :)