How to handle saves in Google Play Services?

Question

Mobile development

Now I'm figuring out how to work with saves in conjunction with UNITY and Google Playe Services.
As I understand it, we can save binary data tied to a specific player (i.e., to a mobile phone) and cannot download another player's saves in the game.
But I need access to the data of other players in a multiplayer game.
Really it is necessary to write the server.

Answer 1

Really it is necessary to write the server.

Yes. Or use something ready-made like Playfab. Google Play services is not for that.