Without much details, all I can do is throw some random suggestions:
-
I noticed that the order in which BeginPlay events for the level blueprint and actors’ blueprints are called is different between PIE and everything else (mobile preview, standalone executable, actual device, etc). If your blueprints somehow depend on the level blueprint being called first/after some of your actor blueprints, you should change that.
-
The PlayerController has three functions called “Set Input Mode UI Only”, “Set Input Mode Game Only” and “Set Input Mode Game And UI”. Try calling “Set Input Mode Game And UI” after your level starts so you can interact with both the UI and the game.