Browsing for Material copies rather than references?

[SpiderPig]

I'm browsing for a material that will be common over several GLTF models.  After saving the models with the material assigned I've found by editing the one material it does not update the models that have it assigned.  Upon further inspection of the GLTF file I saw no file reference to the material.  It seems it has just copied the material into the GLTF file.

Is this intended behavior?  

[Josh]

As discussed, glTF files use embedded materials and this was the intended behavior. I have also agreed to add a feature that allows materials to be externally referenced but currently this is not a bug.