Third Party Fetch server's map before client loads their default map/scene, Steamworks/Mirror

Hello,

Quick question, how am I supposed to update the online scene in a client's network manager based on Steamworks lobby information? Can I fetch the server game data when pressing "Join Game" so that the client loads whichever map the server has? What I've seen when searching is that the player joins the game, loads their default map from their NetworkManager.onlineScene, and using OnClientSceneChange() or something, it can then load the server map. However doesn't this seem awfully inefficient? Can I use NetworkManager.ServerChangeScene() to achieve this without having to reload the game for people already connecting, or use any other logic to set a client's loading map by fetching server game info before they actually start to load the map?
I'm using steamworks and mirror, with a custom network manager that has OnClientConnect() and OnServerAddPlayer(). Also has a steamLobby that has callbacks for JoinLobby, HostLobby, RequestLobbyJoin etc...

Thanks in advance.

 

Hey did you find out how? If yes how can i add a loading screen? i have the logik for it and i use onServerChangeScene but i dont know where to hook it in so it shows the loading screen and its progress. Because when im in the NetworkManager Class I cant call instances of other classes to Update the value of the loading Screen. Please help.

Thanks in advance,