Here’s an example I set up. I don’t know if this will account for actors spawning within the volume as I haven’t tested for that.
It uses the object’s tick event to run code and Get Overlapping Actors to know who is within the volume at that time.
The use of Event ActorBeginOverlap and Event ActorEndOverlap is to figure out if Event Tick should be running.
Set the Tick to disabled by default, also you can change the Tick Interval if you want to run updates slower than every frame. I have mine running once per second.
I wouldn’t say this is production ready, but it solved the situation I was testing against and I figured I’d share it.