A few Polybrush questions - export a mesh, update smoothing

I've been trying out Polybrush for some low-poly world building, and have hit a few snags.

1. Is there any way to export the Polybrush sculpted mesh, so that I can work with it further in a 3d modeling program (Blender)? The Save Mesh feature only creates a .asset file, which I'm assuming is only of use to Polybrush itself. The Unity page claims "You can also take advantage of Unity’s seamless round-tripping with digital content-creation tools (like Maya) so you can further polish models with your favorite tools", but I have a feeling that's only related to ProBuilder and should be worded differently.
   
   
2. Is there any way to update the smoothing / normals (by angle) on the mesh after it has been sculpted? I re-imported the original base mesh with updating auto smooth settings, but it does not update the Polybrush created mesh. The mesh it creates also appears to be unavailable anywhere as an asset file to change this via the Unity import settings (it only appears in the Polybrush component). Do I really need to re-sculpt the whole thing in order to update this?