FBX to GLB / GLTF converted model does not convert different colors

I am converting Naviswork FBX files to GLB format to display with Three.js. I’m using the FBX2glTF (version 2) conversion tool.

The models are converted but different colors seem to get lost in the conversion with the converted model only having one color.

I attach the two models:
Stair_wTextures.fbx (original model from Navisworks)
stair_wTextures_OUT.glb (converted model using the FBX2glTF tool)

Also attach sample screen shots of what the models look like:
Stair FBX.png (original model - this is what the converted one should look like)
Stair Converted.png (converted model)

Would anyone be able to assist with advice regarding how to convert the model to include the original colors.

Stair_wTextures.fbx (552.8 KB) stair_wTextures_OUT.glb (786.2 KB)

Sounds like you’ll want to file a bug on https://github.com/facebookincubator/FBX2glTF/.

Importing to Blender 2.8 (beta) and exporting as glTF from there might be another option.

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