Hmm. While putting everything in exports, did it ask for you to "Copy and Replace" anything? If so, did you copy and replace?
And are you sure the map portal isn't there? Some portals' names decide not to show up until you either run near them, away, and back again, or if you manually check out what map it is by going through.
How many maps do you already have? There's no limit, but pretty soon, after you've downloaded a lot, they start to run off the edge of cape. Have you checked there for the portal, if you have a lot of maps that you actively use?
And some maps need extra media files, not just exports. Are there any folders that say Media? Although not putting these files in the Feralheart media folder might only cause the map to look a little funky, I believe if you still pasted everything in the exports, the portal should show up.