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Not sure, my guess is that they use some native library for this, but some changes are ongoing here since android 13 add some changes too.
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There is no correct way to have a file in a permanent area, note that it is why scope area was created, which is deleted also when uninstalling the application owner.

Maybe in the cloud? Or...

@Pradeep your question is too general, please let us know what type of files you want to save, and then a better explanation can be given.

Text files, can be loaded and saved by edit object and...