juju, You noted I could create custom folders and "point" SU to them. Please elaborate on how to accomplish the pointing. Attached image of Preferences.
Thanks for your help.
WW

@pbacot said:

(Or OP may have purchased materials here in SketchUcation, in which case they are skm. and can be accessed through the materials window)

Thank you for response. I was away for a time, but now back.
I did purchase from SketchUcation and all 8 unzipped files show the materials are skm.
So now, I guess I need some guidance on what to do next. I am unclear on how to set up the files so I can see the new material folders.

Recently purchased several materials for use in SU 2018. Went to Window > Preferences > Files tried to import from the folder where I had previously unpacked the materials. None visible.

Then I did a little reading online and noted that someone said if materials are placed into the SU materials folders, and then you have a version upgrade you will lose all your purchased materials.

Is there a process written anywhere that clearly tells how to build a file or files outside (?) Sketchup. A clear process using small words perhaps? Need to also learn why the materials were not visible to SU in my first step.
Thank you in advance.