In-App Purchase
Tap “Purchase and Restore” under “In-App Purchases” in the "Settings" view to display the "In-App Purchases" view. You can purchase each of the two features—“MIDI file import” and “Using the camera”—by tapping them individually.
Purchased items will show a checkmark on the left.
If purchased items appear as unpurchased after reinstalling the app, you can restore them by tapping the “Restore” button.
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