Set up Unity Gaming Services Cloud Save for persisting player data

Steps

1. In the Unity Dashboard, link your project to Unity Gaming Services and enable the Cloud Save service for the target environment (Development or Production).
2. Add the com.unity.services.cloudsave package to your Unity project via Package Manager.
3. Initialize UGS at runtime with await UnityServices.InitializeAsync() and sign in using Unity Authentication (e.g., await AuthenticationService.Instance.SignInAnonymouslyAsync()) before making Cloud Save calls.
4. Write player data with await CloudSaveService.Instance.Data.Player.SaveAsync(new Dictionary<string, object> { { "key", value } }) — values are serialized to JSON automatically.
5. Read data with var results = await CloudSaveService.Instance.Data.Player.LoadAsync(new HashSet<string> { "key" }) and deserialize with results["key"].Value.GetAs<YourType>().
6. To store public data readable by other players, use CloudSaveService.Instance.Data.Player.SaveAsync on the Public data endpoint; default data is private to the owning player.