corrupt maps in campaign editor

i am making a single player campaign and i have finished 4 maps they all load with no problems in game if i start them individully but if i add them to a campaign through the campaign editor when i select them the screen just goes black or it says the map is unavable or corrupt, i have set the next level triggers correctly but the maps will not link together and most of them wont even load up as a first mission but they work fine normally if started as a single player mission, does anyone know what causes thses maps to not work in the campaign editor? or what makes them corrupt? is the anyway to fix this problem ? please help ive really no idea how to fix this

Everytime you edit the map in WE, you must add it to the campaign afterwards.

i sorted it out the problem is the campaign editor will not accept maps over 4mb so if anyone els has the problem just reduce your map file size and it works