Foliage isn’t dynamic like that, I’m afraid…
If it’s a small amount of foliage, you can just put the actual meshes on the actor and attach them.
If it’s a larger amount of foliage, you need to write a blueprint to instance the foliage and attach it to the actor.
Then it will move with the actor.
PS: If you want to know how to make your own foliage spawner, it’s not that bad, I can explain, but I’ll need to see the mesh first 