Starting with “2.” - It sounds like you’re still auto-possessing the default pawn. You need to explicitly possess the ‘CameraActorBP’ - BUT - it looks like CameraActor BP is A child of ‘CameraActor’… It needs to be a child of ‘Pawn’. (To say it a different way, a Pawn with just a camera inside of it will give you what you want) > Once it’s placed in your level select it and change ‘Auto Possess Player’ to “Player 0”
Then, for the button click, Implement the logic from my previous post and you should be able to control mouse + fire that ‘on clicked’ event