I bought the Premium, but the black box does not work. What should I do?

Turn on Black box in the app settings.
Also, check the app is not blocked by the phone’s settings to work in background mode. If the application “falls asleep” after folding, the Black Box will not work. Black box is one of the options of the app, it works only if the app is active.
Add permissions for the app to work in the background mode, and add it to the exceptions for power saving mode.