Actor falling through terrain

i have an actor where there is a static mesh and a box collision as its child. the box is set to block all. when i simulate physics and let it fall to the terrain, it goes right through. terrain also is on block all. the mesh however successfully collides with my player, but nothing else. not even a straight up blocking volume set to block all.

the collision box should be the root of the hierarchy. if collision is a child, attached to a parent, it wont stop the parent from falling through.

Duh. Thanks. Out to dinner; will report back.

WORKED! Thanks man!

I had no idea that was needed. This fixed my issue. Thank you!