Using sapling, masked textures wont appear in Unreal.

If I leave the trees and leaves as separate meshes in blender, then I can apply the leaf mask material in Unreal and it works perfectly. If I combine the leaves and trees into one mesh, the bark shows, but the masked leaves go totally invisible. Anyone know why this is? I would leave them separate and just blueprint them together and drop them in the world, except that I can’t use the blueprint in the foliage brush… It only accepts meshes. hence I have to place them each individually. Anyone got a fix for this?

Set coordinate to 1 for the leaves… Solved.