static public StorageKeyValue GetString(string key, string defaultValue = "")
    {
        if (storageInstance == null)
        {
            Debug.LogError(" Create a ConnectedStorage instance first"); return(null);
        }
        StorageKeyValue kv = new StorageKeyValue(key, defaultValue, storageInstance);

        return(kv.Load());
    }
    static public StorageKeyValue DeleteKey(string key)
    {
        if (storageInstance == null)
        {
            Debug.LogError(" Create a ConnectedStorage instance first"); return(null);
        }
        StorageKeyValue kv = new StorageKeyValue(key, "", storageInstance);

        return(kv.Delete());
    }
    static public StorageKeyValue SetString(string key, string value)
    {
        if (storageInstance == null)
        {
            Debug.LogError(" Create a ConnectedStorage instance first"); return(null);
        }
        StorageKeyValue kv = new StorageKeyValue(key, value, storageInstance);

        return(kv.Save());
    }