fix GetMrcFileDataAsync

            string apiPath = isThumbnailRequest ? MrcThumbnailApi : MrcFileApi;

            using (MemoryStream data = await this.GetAsync<MemoryStream>(

            String payload = String.Format("filename={0}", Utilities.Hex64Encode(fileName));

            Uri uri = Utilities.BuildEndpoint(

                this.deviceConnection.Connection,

                apiPath,

                string.Format("filename={0}", Utilities.Hex64Encode(fileName))))

                payload);

            using (Stream dataStream = await this.GetAsync(uri))

            {

                dataBytes = new byte[data.Length];

                data.Read(dataBytes, 0, dataBytes.Length);

                dataBytes = new byte[dataStream.Length];

                dataStream.Read(dataBytes, 0, dataBytes.Length);

            }

            return dataBytes;