based on
https://developer.android.com/about/versions/11/privacy/storage
I cannot create an app-specific directory
Starting in Android 11, apps cannot create their own app-specific directory on external storage. To access the directory that the system provides for your app, call getExternalFilesDirs().
and I googled for a solution but couldn't find any clear article showing the right way to save files like backup data.
What I found are some native tries that do not fill the needs.
So anyone has any solution for that?