I can’t see any material on the V-ray.
They aren’t kept there anymore, they are all in Chaos Cosmos Browser
I’m downloading the materials to my computer. When I install external materials, there is the same problem again
What happens if you try to use the material and view it in the material editor?
Isn’t it better to see the visuals on the list while you have to see it from the list one by one?
Are you still using SketchUp 2019 as indicated in your profile?
Have you tried contacting V-ray customer support?
Yes. But what happens when you do?