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    public GameObject[] CloudImageArray1 = {
                  null,
                   null, null, null,
        };

 private void Start()
 {  // CloudImageArray1[0]  = Resources.Load("Assets/Prefabs/UI/UIButtonBuild", typeof(GameObject)) as GameObject;    
    CloudImageArray1[0]  = Resources.Load("UI/Cloud/Cloud_10.prefab", typeof(GameObject)) as GameObject;
     
 }

//Грузим из (Assets/Resources/Prefabs/prefab.prefab)
var prefab = Resources.Load<GameObject>("Prefabs/prefab");

    public GameObject[] CloudImageArray1 = { null,
                 null, null, null,  
     };
        #region  
           private void Start() {
   
 CloudImageArray1[1] =   Resources.Load<GameObject>("UI/Cloud/Cloud_12");
  }