Just upload your map to the steam workshop, subscribe to it, and have all of your friends subscribe to it. When you load up the game to play it, make sure you are selecting the steam workshop version that you subscribed to and not the local version that's on your hard drive. The error your gett...

I've searched around everywhere for an answer to this, and can't really seem to find what I'm looking for. I'm trying to make a transition in my map from z dark and gloomy starting area to where, when you buy a door, the new area is a very bright office-like environment.