Can't add Set Position (Mesh)

I'm using Unity 2021.3.0f1 on Windows. It's an HDRP project with Visual Effect Graph 12.1.6.

I want to get positions based on the vertices of a mesh, so I want to use this block:
https://docs.unity3d.com/Packages/c...raph@11.0/manual/Block-SetPosition(Mesh).html

But I can't find it. If I select Create Block>Position, all I see is the Position (Signed Distance Field) Block, along with the other standard Set Position options. I don't see either the Mesh or Skinned Mesh options. Searching for Position, Mesh, etc, doesn't show anything either.

I downloaded the Visual Effect Graph Samples project and opened it with the same version of Unity that I'm using. I was able to open and view the demo that uses the Position (Skinned Mesh) block. I transferred the AshesSample.vfx file to my project, and was able to open it and use it without issues, but I still can't add that block to my own graphs, or find it when I search for it in either project.

 

I did not, that's the first time I've heard of that setting. I'm not sure where I would have heard of it. It would be nice if it was mentioned on the block manual page that I linked to. It has a note about it being experimental but nothing about access being limited. It would have saved me hours of frustration.

Thanks