Tweetsharp UploadMedia media take huge times for upload images

I am download image from amazon s3 bucket to my local memory stream. When it is download then I have upload image with text in twitter using Tweet-Sharp dll.

When I was using local image with upload then it is working fine. If I am using amazon bucket file then it is not uploaded.

Here is my code

 string fileName = Path.GetFileName(Convert.ToString(socialMediashareProduct["ProductPath"])); //Path.GetFileName(socialMediashareProduct.ProductPath);

                                Stream fileStream = CommonFunctions.GetImageinS3Bucket(CommonFunctions.ProductImages, CommonFunctions.Thumbnail, "T_" + fileName); //File.Open(Convert.ToString(socialMediashareProduct["ProductPath"]), System.IO.FileMode.Open, System.IO.FileAccess.Read); //File.Open(socialMediashareProduct.ProductPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);

                                tempDisctionary.Add(fileName, fileStream);

                                string hostName = CommonFunctions.ReturnHostName();

                                string callBackUrl = hostName + Path.AltDirectorySeparatorChar + "Default.aspx"; //Path.Combine(hostName, "Default.aspx");

                                string tempString = string.Empty;

                                tempString += Convert.ToString(socialMediashareProduct["ProductName"]);

                                tempString += " This item is provided by " + Convert.ToString(socialMediashareProduct["BrandPartnerName"]) + " through ClosetAuction.com";

                                tempString += " Yay! I earned ponts!";

                                UploadMediaOptions uplodMedia = new UploadMediaOptions
                                {
                                    Media = new MediaFile
                                    {
                                        Content = fileStream,
                                        FileName = fileName
                                    }
                                };

                                TwitterUploadedMedia uploadDedMedia = service.UploadMedia(uplodMedia);

                                if (uploadDedMedia != null)
                                {

                                    if (!string.IsNullOrEmpty(uploadDedMedia.Media_Id))
                                    {
                                        SendTweetOptions sendTweetOption = new SendTweetOptions
                                        {
                                            Status = Convert.ToString(tempString),

                                            MediaIds = new List<string>() { uploadDedMedia.Media_Id },

                                        };
                                        TwitterStatus twitterStatus = service.SendTweet(sendTweetOption);

                                    }
                                }

"uploadDedMedia" object is always null. Any one help me.