Join via Steam Overlay
If you want to give your friends the ability to join your games by clicking “JOIN GAME” from the Steam Overlay / Friends Menu, you have to implement the functionality within your game, here is a barebones example of how we do that
Joining via Steam Overlay
This example will allow you to join a friends multiplayer session from the Steam Overlay (SHIFT+TAB) while the game is already running.
SteamCore Session Setup
If you are using a “SteamCoreSession“, use the following example, The logic in this example is implemented in the players PlayerController
Advanced Session Setup (Legacy)
If you are using the “Advanced Session” setup, use the following example. The logic found below is implemented in the games GameInstance.