Can't find saved materials in default tray

How do I get my saved materials to show up in the Materials section in the default tray? The materials folder there has a bunch of default materials but not the ones that I save into the file location that I have set up for materials.

You should put the materials into a sub-folder in the Materials folder. And look farther down in the Dropdown list. The folders you are showing in your screenshot are the native materials which are in a different location.

Got it, thanks! Creating the subfolder fixed it.