public void Release()

Unity reference counts the loaded object, so loading the same asset through several Loadable<T> instances works correctly, and the object unloads only when the last reference is released.

Each Loadable<T> instance holds at most one reference. Repeated Loadable<T>.Load or Loadable<T>.LoadAsync calls on the same instance return the same load operation without taking another reference, so a single Release frees it and any further Release does nothing. Release every instance that you loaded, otherwise the object stays loaded after your code stops using it.

Release is not recursive. If this Loadable references a ScriptableObject that has loaded Loadable<T> fields of its own, releasing this Loadable does not release those inner ones. Release each Loadable<T> that was loaded.

The message of a MonoBehaviour is a good place to release its Loadable<T> fields, so that unloading a scene or destroying a prefab instance does not leave content loaded that nothing can reach.

Release has no effect on content that was loaded from the AssetDatabase in Play mode, because that content is not reference counted. Refer to the Loadable<T> remarks for details.