Tree brush import issue, meshes in wrong order?

Baasically, this particular tree is acting up. Others have been brought in successfully.

Apparently, simply having one mesh with two materials isnt enough, the materials have to be bark first, leaves second or the tree doesnt work. How do I make sure this happens?

Unity for some reason is importing the leaves first, then the bark… so the materials are in the wrong order… has anyone had this problem? When i try to apply the tree to a brush it says “No valid renderer” for the object.

Sorry about the last post, I fixed the issue.

I noticed the Mesh Renderer was greyed out so I made a prefab for the tree and it works.