Widget not showing up in mobile apk

I am a beginner in Unreal Engine and I am trying to create a game for android. I am not able to show UI in mobile package (apk). I tryied all of the compressions. In viewport everything is how it shoud be, but in apk, I can’t see any UI, any button. I can see just the joysticks from controllers. I tryed using add to player screen bp node with no result. The code is in the image.

I tried deconnecting the owning player node and still with no results. What is wrong?