How do i add collisions to my snow weather effect using Niagara to stop it from falling through the ceiling?

Hello, im currently making a level environment of a Castle in a snowy mountaintop and i managed to get some weather effect working to look like snow falling however, for some reason, i can’t get it to stop falling through buildings i placed. The snow falls right through and appears inside. i checked everywhere and put the collisions and kill if collided node in the Niagara BP but it still doesn’t change a single thing. It also falls straight through the landscape i made as well.



This is my first time using Niagara by the way, so I’m not fully knowledgeable about it. Is there a way to fix this or perhaps make a separate volume that kills the particles on contact in a way? I don’t want to see the snow fall straight through