I think there really some mobile control problems in Unreal Engine. You can only use virtual joysticks and that joysticks aren’t so customizable. For a couple of days, I tried to make custom buttons for input controls but no success. And no replies are coming from developers in this issue.
I’m trying to make flight movement and roll buttons with UMG but that ■■■■ widgets don’t get input from axis controls. In your case, you want to make camera movement just swiping on screen. Well that would be excellent.
I think Epic Games must concentrate a little on mobile gaming. Graphics are ok, but controls are really bad. Actually if they have implemented new features on Widgets, you and I could have done what we intended to do.