I’m using a [free foliage pack][1] I found. The screenshots below show what happens before and after I put them into the foliage list. They turn grey and the mesh turns into loads of checkered boxes. The folder was in the Engine Content, but I’ve since moved it to my Starter Content folder. I still get the same problem, except the textured meshes are grey before I drag them in instead of after.
I have same error. Did you find any solution?