Meh, I downloaded this yesterday, fuck Firebase, it doesn't work.
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Hello :)
Don't worry, once you understand how Firebase works, it becomes very easy to use !
You must create and link your Firebase database to your game first, follow the steps bellow.
Open Gdevelop → Open the template project → Go to Main menu scene → open the events tab → read the first comment (its a step by step + video URL on how to create and link your Firebase database to the game)
I also made this step-by-step tutorial video to make things even easier 😉
Did you create your Firebase database and used the info and wrote it in your gdevelop project (Firebase config section) ?
Please make sure you followed the step-by-step video and applied all the steps with the correct naming.
+ Make sure to read the comment in: the Project → Main menu scene → events → (Show leaderboard names and scores from Firebase) group event.