The plug-in only works with diffuse textures (albedo), not bump map, normal map or other texture shaders, I wonder if the model you are using is more complex in terms of textures and shading. Only the diffuse texture will be rendered. Can you share the glb model?
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Can you just post the glb via a service like https://sendgb.com ?
I am not a blender expert, but I looked at this video previously about texture baking (it seems pretty complicated, but it got the result.)