How to hide "can only be called from the main thread" warning - Unity Answers
TrySetSetString can only be called from the main thread. · Issue #261 · firebase/quickstart-unity · GitHub
c# - Use Unity API from another Thread or call a function in the main Thread - Stack Overflow
문제해결)Unity)UnityException: ~ can only be called from the main thread.Constructors and field initializers will be executed from the loading thread when loading a scene.Don't use this function in the constructor or field
Rewarded Ad callback can only be called from the main thread Error · Issue #602 · googleads/googleads-mobile-unity · GitHub
get_gameObject can only be called from the main thread · Issue #573 · sschmid/Entitas · GitHub