Where do materials reside in Maxwell for Sketchup

[sketchgirl1]

I downloaded an MXM material to my desktop, and applied it to my SketchUp model. Later I sent the material to the recycle bin, and then its properties (shiny white) disappeared from my new render of the model, leaving just a muddy brown color similar to what it looks like in the model. When I restored the material, it became shiny white again in my next render. With AutoCAD, Revit and Sketchup, once you applied the material to a model, it was there in the file, no matter what you did with it elsewhere. Is Maxwell different? thank you.