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document can be recorded.
NOTE:
1.
There are many kinds of Android phone, so the user interfaces maybe
different on some brand phones or different scales of the same brand.
2.
Application permission requirements, allow the necessary permissions when
the APP is installed (allow background running, using Bluetooth, operation on the
folder, reading the application list, etc.) and also set the permissions of the APP after
installation: Allow background running, never shut down when lock screen, allow
self-starting (it is used to prevent the system from forcibly exiting the APP when
recording data), etc.
