Best way to import layered textures in a terrain?

Hey guys, I recently created a terrain using World creator , and having problems with their Sync-tool (automating export and import on unity) I am looking for a way to manually export and import the map I want to use on unity.

Like how does Splatmap and heatmaps works , or how do I preserve the shineness of smooth materials in export ?

Does anyone know a good ressource about that particular subject ?

Thanks a lot!

You may get faster support on the official WorldCreator Discord server: World Creator
The devs are very active there.