Is that true that blender's cycle materials doesn't work on sketchfab.....because whenever i upload i get greyed out model..no materials....and i don't have any UV or any other maps applied over it....so no need to bake that
https://www.youtube.com/watch?v=fxKl-9RLYzw they do work you have to work with the app alot here is the best video to help you.