I'm really struggling to work this out. I've uploaded my file here:
I made some curved stairs. Basically, I want the steps to stay nice and sharp, but I'd like to smooth the vertical, curved sidewalls of the staircase. Currently I can't auto-smooth because all the steps are individual pieces that are not connected. I've tried merging vertices and faces by distance, but I just cannot work out how to join them.
I hope this makes sense, and thanks in advance for any help! :)