Import materials from 3D Warehouse to my material browser

Hello everybody. I have readed some tutorials about take materials to my sketchup, but, despite I have dowload 2 o 3 tiles from 3d Warehouse, I can´t see them at my materials library. I have created a foldes with them and I have follow these steps**, but the folder appear empty in my library. Can´t read the tiles. What I am doing wrong?

** Importing materials palettes - #4 by DaveR



Most likely because the tutorial is for the desktop version of Sketchup, while you are using SketchUp for Schools, web version…