I'm trying to use the Pedestrian overpass _ korea _ yunseul mod and need some help. I have prop snapping and prop & tree anarchy installed which seem to be working. However, after I place the stairs, I cannot figure out how to connect a bridge to them. The bridge segments are always at ground level. I assume I am missing some prereq since even trying to place props that work on buildings will not work on the stairs. Can someone help fignure out what I'm dong wrong? TIA.