Thanks for contacting us and choosing our product!
Because your topic included too much URL, it may got auto blocked and we don’t get any notice about this topic.
In our demo Material attribute use Image type (Products -> Attributes): https://prnt.sc/ilJwRAWuPCQM
and you need to set image for each term: https://prnt.sc/PS6bPLh6GYsH
Hope this helps!