I am having a hard time importing my old materials into Sketchup 2026. I tried the “Open or Create a Collection” and found the default materials (.skm) in the Program Data folder, but I can’t find my custom saved materials. Any help would be appreciated. I’m using a PC, not MAC.
Codex is your friend in this situation. It can find materials you lost, fix them, rename them, and even generate custom materials automatically, saving a lot of manual work.
I just figured out how I had stored them. Problem solved.

