Custom materials problems in sketchup with mac

Hello everyone,

I’m on Mac and using Sketchup Pro 2023.
I’m having some difficulty creating my own material folders in Sketchup.
I manage to create them, but not to keep them after restarting Sketchup.

I tried several options as indicated on tutorials, but none worked in the long term.

  • Import a new texture into a native category.

It works, but when restarting Sketchup, the texture becomes a flat color and loses its attributes.

  • Create a new list of materials and import a new material into it.

It works, but when restarting Sketchup, the texture becomes a flat color and loses its attributes.
The strange thing is that this new folder does not appear anywhere. Neither in the “Materials” folder nor in the “ShippedMaterials” folder
As such, I am having difficulty understanding the difference between the “Materials” and “ShippedMaterials” folders. In which should the integration of new materials be given priority?

I did the test with SKP 2022 & 2023, same problem.

Is there anyone out there who can point me to a solution?

THANKS

Gael