Hello.
As of right now, the Unreal plugin can’t detect texture maps (doesn’t matter if they are separate or packed) and creates blank materials instead. It also tries to import the FBX format (which doesn’t always have a unified file structure) instead of leveraging the perfectly working GLB file.
Also on a side note about the conversion process when uploading to FAB, the system only takes the first FBX or OBJ file that it finds and therefore doesn’t allow for defining multiple models if I want to have one-file-per-model in the non-converted version or even want to have multiple variants sharing the same mesh with different textures.
It also doesn’t let me pick channels from packed maps but that’s not so important.