The black material cannot be modified

When I use blender to render the model, it is all colored. When I export the glb format to sandbox, it appears a black part, which is not affected by my material and stays black.

The model originally had 50K faces, and I subtracted the triangular faces in the UE and only had 10K.This model has an animation and bones.

How are set your materials in Blender? Do they match the convention from the doc?