It does…
So you’ve setup a FloorTrace channel, NOT an object type. The object type of your mesh is WorldStatic. You’re looking for something with EObjectTypeQuery. I don’t have the editor in front of me at the moment to give specific guidance but I suspect if you change your AddObjectTypesToQuery to WorldStatic (might be under EObjectTypeQuery::Type::WorldStatic or something like that) then it should work.
Again, you’re doing an ObjectType trace so you need to make sure the object type of your mesh lines up with what you setup for the trace.
EDIT: That’s partly why I suggested prototyping in BP first as you will get to see all of this exactly from the BP node parameter suggestions. It can be a little tricky out the gate in cpp.
EDIT: Oooooh, I believe I found exactly what you’re looking for. This provides the detail I can’t at the moment and he’s doing it in cpp but showing what each piece relates to in editor. https://www.youtube.com/watch?v=50h2U_d1XVc