Foliage

Hello, I can’t see the option “Save As Foliage Type…” when I right click the foliage asset thumbnail. I’m using Quixel assets, and in the content browser, it’s listed as “Static Mesh Foliage”. I can add it to the Foliage Palate and paint it onto the scene, but I can’t use erase. I can see a little grey disk icon in the corner of the thumbnail, but clicking it doesn’t seem to affect anything.