I think that all the aoecpn files when brought into the Campaign Editor should reveal all the smaller scenarios that were used to make the file.
If you open the original campaign files using the Campaign Editor, it shows you all the smaller scenarios used to make that campaign.
However, this is not the case for ALL of the downloaded campaign files.
These files are not corrupted as they are all playable in the campaigns tab, suggesting that something’s wrong with the Editor, and not the files itself.
Please take a look at it. I have no idea why this is happening.
Newest version, Steam. (I got a feeling MS Store has this bug too, cant check it tho)