Hi @Roy_Anderson,
You can use online conversion tools to transform your .glb files to .FBX or .obj+.mtl
Support for .glb files had been requested in the past, and I can see that I’ve responded to a similar request with “use Blender to convert to obj+mtl”.
Alternatively, you can try TinkerCAD as mentioned above.
Hope that helps!
Geoff @ TechLeap