What trigger do I use to save a replay of a campaign map?

I noticed that even if I load up an exported campaign map in custom game there is still no option for save replay when I beat that level... I want to be able to save a replay of my campaign map so it can be a type of movie demo of my campaign mod... what do I have to do?

You have to remove the "set campaign to ..." line. It would be somewhere in the map initialization. Probably the first line. Do this and you can save replays of the exported campaign maps.