[Online] Loading screen does not work when clients connecting to host

[raniceyue]

When a client connects to the host, they are able to see the camera changes before the camera goes to the lobby camera.

I have tried to fix this, using the following methods

1. When the MultiplayerGameMap loads, I immediately add the loading screen to the viewport
   • This does not work, as the player will still see the camera change BEFORE the loading screen comes out
2. In the BP_OnlineMultiplayerPlayer, EventBeginPlay, I add the loading screen to the viewport for that pawn instantly, then make a call to remove it from the level blueprint.
   • This also does not work and has the same issue as (1)

@LiuTianZ @NBH99 Please help :(