Hello, I am modeling a hollow cylinder with an angled top, and am trying to place a shelf inside of it. I do this by making a vertical reference plane and extruding out to the cylinder surface, but I get an error for zero thickness. I'm confused because it should be able to easily intersect the model at multiple places. I can do it by making it a multi-body part, but I would rather not do that.

Any suggestions would be greatly appreciated!

Let me try the images as links and see if that works:

https://prnt.sc/klrk3p

https://prnt.sc/klrkhl