KASM Workspace browser access to the local network.

Has anyone here maybe used KASM Workspace and has technical knowledge about this solution? I installed it on a Qnap and it works very well. I started persistent sessions and it streams browsers very nicely. However, I cannot manage to give the browser access to network resources. When I try to save anything locally, I only see container resources (Desktop, Downloads, and Uploads directories). It seems to me that the key might be volume mapping, but it clearly overwhelms me.