Unable write file

No, this won’t work on any device with Android version > API 22 (since Android 6, runtime permissions).
It’s not a bug and has nothing to do with Android 10.

As I posted several times, the File component does not ask for WRITE_EXTERNAL_STORAGE permission automatically (if you save a file). You MUST ask for it manually:

Note @Kodular:
But of course: the File component should automatically request WRITE permission.

See also here:

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