You do realize that when you download the presets, it's usually just so you can see the creator wearing them, not for your own use, mew?
If you knew that, then well, there are a number of things that could cause a preset to not show up. The most common being that the creator exported the preset as Username_1.fhp, then logged in with different letter-cases, such as username, USERNAME, or UsErNaMe. Something like that.
As for maps, is it a .fhm file you are putting in exports?
If it's anything besides a .fhm file, then it won't show.
If you are placing .fhm files in exports, then try restarting FeralHeart.
-Ninja'd by Reckless.