About your second story problem, you can do 2 things. One, you can add columns. Two, you might not have a wall connected- so make sure all walls are connected.
Thank you so much! I figured it out in the end, after about half an hour of shouting at my computer to no avail. Also, thank you to the anon who gave me the exact same answer, you're both very kind, and I hope you're having a great time!







