When you make & successfully export a map, a .FHO, or FeralHeart Object, file is created. This and the .FHM, or FeralHeart Map file should be sent to others & put in their "exports" folder. This is so that they can see all of the meshes on the map without having to download the meshes themselves.
Long story short, no, people don't need to download the objects to see them.