How do I detect when an actor enters the camera?

Development Cinematics & Media
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2

You can use the DeprojectScreenPositionToWorld method in APlayerController to find the 4 corners of your screen in-world.
With that you can create a box and see if the actor’s location is inside that box.
For that you have IsPointInBox from UKismetMathLibrary

You don’t need to test collision with this, just positions in the world.