Material IDs not updating or showing all

this is so frustrating. I edit my model in sketchup with new material IDs and reupload only to discover most or none are updated when viewing the 3d properties (sketchfab editing). why is this happening and what is solution?

I highly recommend reading these two articles about uploading from SketchUp:

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thanks. I’m learning. a bit of a hassle though. clicked on the first link, that took me to another link that told me to donload a plugin that told me to download another plugin to run that one…sheese.
thom thom