I've just noticed that the Skins page doesn't show my uploaded skins.
It was working until maybe a month ago or so...maybe something got inadvertently messed up while working at the new Setup page?

As you can see the Blues Brothers skin shows on the preview but not on the car.
The other skin shows the same problem too.

I don't understand. From what I can tell you have two skins uploaded. I see those in your screenshot.
So you must mean something else.
"shows on the preview but not on the car" - there's only ever been a preview hover. There's not been any on-car rendering.

I think he's thinking of the 3D view when you click on a car here:

https://www.lfs.net/cars

And can select your own skins to see on them.

Would be nice to have more realtime renders, but pretty low on my list of things to do!