static IEnumerator EnumerateRequest(StorageRequest request, Action <bool, byte[]> callback)
        {
            yield return(request.request.Send());

            request.Result(
                response =>
            {
                Debug.Log("Transfer completed - succeeded? " + !response.IsError);

                byte[] bits = null;

                if (!response.IsError)
                {
                    bits = request.request.downloadHandler.data;
                }
                callback(!response.IsError, bits);
            }
                );
        }