How do I paint Different Trees in Fortnite?

Hi everyone, so my friends and I are attempting to build out a map that requires dense forests and swamps. We have been able to use the foliage painter, but there’s a problem.

We were able to create a new static mesh foliage instance and set it to a pine tree, but I could not find any other trees that would work with it.

Whenever I would attempt to drag and drop a tree like a ‘Hexylvania HAF Tree12d’ from the content browser into the Static Mesh section of our foliage instance, then it glows red and doesn’t allow us to set it.

I have also attempted to follow the process seen in the link below by dragging the Hexylvania HAF Tree12d into the game, copying the static mesh from this tree instance, and then pasting it into the Mesh section of our foliage instance, but nothing happens whenever I attempt to paste it.

Am I going about this correctly? Or is the foliage tool just extremely limited at the moment?

Any help would be appreciated!

Link of attempted remedy: