(Content Problem) Can't get artists completed maps to display in coder's version of project

I am trying to transfer 3D umaps from one uproject to another via github, but when I try to open the umaps in the new project the 3D mesh doesn’t appear. Why is that? Perhaps a crucial file is missing. What files are necessary for the successful transfer of the umaps? What else can be done to ensure a successful transfer through github.

Attached is how it looks on her computer, on mine when i load the same umap, with the same assets in the same folder structures, all I See are several icons, and no 3d geo/map at all.

Any ideas how we can overcome this problem?

Are you using github as source control or? Better use Perforce as it handles big binary files better than github.