Im not sure if you can edit the campaign maps. Plus anuke (which is one person not a team) already made attack maps on the campaign, which are; Fungal Pass, Overgrowth, and Salt Flats I think.
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hey theres a bug that does not allow me to enter a campaign map, the launch button is greyed out they it does if you dont have enough resources to enter the map, but i do though. I dont know if its because of the example mod i loaded in or just an actual bug.