Invite Dropdown Prefab Invited (UserData) Event

[nimble bloom]

Hello.
I'm really new to developing multiplayer games so the question I will ask now may sound ridiculous to you.
I have a SteamManager.cs code and attached it to the files.
I have imported the Friends Invite Dropdown prefab into my project and can't find a way to make the Invite button send Lobby Invites to people.
Is there an easy way to do it ?
I saw in a tutorial that you can just use the Invite method which is included in LobbyManager.cs but since I'm not using it I need help with implementing one into my SteamManager.cs code.

[buoyant fable]

Never use SteamManager.cs

first thing that jumped out at me

First the logic of it

The code to send an invite to a lobby can be done from either the lobby data of the lobby you want to invite to or the user data of the user you want to invite.

So for example

From LobbyData

Assuming myLobby is a valid LobbyData of the lobby you want to invite them to

myLobby.InviteUserToLobby(thisUser);

https://kb.heathen.group/toolkit-for-steamworks/unity/objects/classes/lobby-data#invite-user-to-lobby

From UserData

Assuming thisUser is the user you want to invite

thisUser.InviteToLobby(myLobby);

https://kb.heathen.group/toolkit-for-steamworks/unity/objects/classes/user-data#invitetolobby

The Friend Invite Drop Down

https://kb.heathen.group/toolkit-for-steamworks/unity/objects/ui-components/friend-invite-dropdown
So this UI element just raises an event when a specific friend is selected. You are expected to handle that event and then invite them

So for example if you assigned the following method to the Invited event

public void OnFriendInvite(UserData thisUser)
{
  thisUser.InviteToLobby(myLobby);
}

Your next logicle question is how do you get "myLobby" and frankly that depends on your game and your UI. Be sure you have read the article on Steam Lobby 80% of new to Steam devs have missconceptions as to what a lobby is
https://kb.heathen.group/steam/multiplayer/matchmaking-tools

Anyway you would be doing this sort of thing in a menu or UI that is managing a lobby so you will already have this rather you have it from a LobbyManager component or maybe this is part of yoru Party UI so you can simply check for a party lobby first ... that might look like this

public void OnFriendInvite(UserData thisUser)
{
  if(LobbyData.GroupLobby(out var myLobby))
    thisUser.InviteToLobby(myLobby);
}

Or maybe this is a invite for a session lobby

public void OnFriendInvite(UserData thisUser)
{
  if(LobbyData.SessionLobby(out var myLobby))
    thisUser.InviteToLobby(myLobby);
}

Point is there are countless options that depend on your specific UseCase

and important think to understand is that a Steam Lobby is basically a chat room ... a player can be in more than 1 at a time

It is NOT part of your network setup and has many uses out side multiplayer

understandign that will help you expand how you think about Steam Lobby

Worth noting you can invite a user to a game not just a lobby so this UI element is useful for more than just lobbies