How do you make a private server in the Arid map?

I've been looking all over the internet to try to find a way to play the Arid map with my friends by hosting a private server. I've been using the Unturned dedicated server thing from steam to host servers but I've never got to play in the Arid map, it always says some type of error when I try it so I am forced to play the default map because I don't have much of a detailed guide on how these things work. I've watched multiple YouTube tutorials but not a single one on how to play/host the Arid map. Please help