Missing materials after blend file export to glb?

I have this blend file that includes materials,textures and animations

When I export it to the glb format and drag it in the Babylon sandbox the materials don’t show and instead I get they plain grey version of the mesh.

How can I fix this ?

In blender:

In sandbox:

You have to use nodes and Principled BSDF on your materials.


(I just tweaked the Main material here)


You are awesome. Thank you very much.