I just figured out that I could export my mesh to fbx. file but when I open the file in substance designer 3 it's completely invisible. My mesh is just a large sphere because I'm making a moon, and I only have the 30 day trial of substance if that's any help. I don't have any ideas what could be wrong, I have been hoping I could save meshes forever and when I finally find out I can it doesn't work.
Thanks in advance for any help.

Common import/export problems are:

Your object is too big or too small

Your object is located out of view or at some extreme location.