the obj/mtl is not working for me in sketchup 2020 with transmutr plugin. In the obj some geometry is missing and the mtl is not connected.
This may happen when # 3ds Max Wavefront OBJ Exporter v0.97b - (c)2007 guruware has got used.
fbx format works much better for exchange in my experience.
The file doesn't work on 3ds max 2022. I try to merge to the scene the objects, but I can't, the system starts processing (processing what?) and I have to abort the file and re-open. I paid for these models and I cannot use them.