Are you sure that B4A is connected to the device you're running the app on? Double check by going to the Logs tab, clicking on the Connect button & then selecting the device you're running the app on.
Yes - but you can run an app on your device in debug mode but the logger might not be connected. If you have run an app on one device from B4A, then switch to another device, the logger doesn't automatically switch. You have to manually connect to it.
Did you switch usb debugging to on (developer options in the phone). On my Huawei Mate 10 I have to switch it to on every session as it automatically goes off after a while.
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