Re: Why does Platform Trim not work on Platforms?
@TylarTyger Hello! It might be helpful if you could take some screenshots of your build so we have a better idea of what's happening.
In the meantime, when you select the platform trim you want, hover over the floor of the platform and click there to add it; just as if you were placing carpet or tile. As for the stairs, I've found they can be really tricky. Make sure you have a full brick of space at the top and bottom of the stairs for sims to enter / exit. Also, the stairs landing can't be off the lot. Hope that helps but if it doesn't, let us know.