Ok, so i downloaded these rly epic meshes from some people, and they worked great while testing my map out. Then, i exported my map when it was done. So i go to cape to try it out with a winged char (there are floating islands i wanted to test) but when i got here, i noticed almost all of my downloaded meshes weren't there, yet a few still were. When i practiced in 'map maker' it worked, but when i exported it and tried it in fh, it doesn't show, anyone know why?

The objects that don't show are the seahorse particles and every tree i downloaded (birch oak tall ect.).