Exporting Detail Meshes from ProBuilder, Polybrush

Hey gang,

So I have a whitebox level that I'd like to export and share with my environment artists. I've placed some tree assets down using Polybrush. I'm attempting to export my level geometry using Probuilder - Export - OBJ. However, even with each tree (there's a lot of them) selected, the OBJ doesn't include the detail meshes when I attempt to import it in Blender. Am I doing something wrong in this process? Should I be able to export detail meshes with the rest of the probuilder geometry? Thanks in advance.