Rain going through walls despite collisions being enabled on said walls.

See screenshot of a frame here: Screenshot by Lightshot

I rendered using these settings: Screenshot by Lightshot & Screenshot by Lightshot

I also have RT turned on, and baked the lights.

What exactly am I doing wrong? Thanks~

p.s. - (I’m relatively new to Unreal Engine 4 and 3D programs in general; interested primarily in rendering frames for archviz and photorealism outputted to videos.)