If you make a single mission called Sm12.mis, it needs to me inside a folder called Sm12, and that folder needs to be inside the SingleMissions folder with the others.
Note that single missions will also load campaign missions. So if you made a harbor mission, for example, you might see competing traffic from the campaign.
You can actually make a single mission that puts a player sub someplace on the map, then just play and you'll see the campaign stuff (most of it).
tater
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