Physsic object does not detect floor?

I want to make an actor that explodes as it hits the floor, and i know how to do everything no worris there, but the actual floor detection… i cannot get it to work. i try everything but the the object simply does not collide with it somehow. the object does not fall through the floor but the “Hit” Event and the “Begin Overlap” event does not activate once the object hits the floor? why does the object not detect the floor??

First of all check if “Generate hit events” is checked on both floor and your object. Then check your collision setup for both objects. Make sure they don’t ignore each other.