File Size Goes to Zero when Returning FileStreamResult from MVC Controller

I am attempting to download a file from Azure Storage in the form of an CloudBlockBlob. I want to allow the user to select where to put the downloaded file, so I have written the following code to do this ``` [AllowAnonymous] public async Task<ActionResult> DownloadFile(string displayName) { ApplicationUser user = null; if (ModelState.IsValid) { user = await UserManager.FindByIdAsync(User.Identity.GetUserId()); // Retrieve storage account and blob client. CloudStorageAccount storageAccount = CloudStorageAccount.Parse( ConfigurationManager.AppSettings["StorageConnectionString"]); CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient(); CloudBlobContainer container = blobClient.GetContainerReference( VisasysNET.Utilities.Constants.ContainerName); // If the container does not exist, return error. if (container.Exists()) { foreach (IListBlobItem item in container.ListBlobs(null, false)) { if (item.GetType() == typeof(CloudBlockBlob)) { CloudBlockBlob blob = (CloudBlockBlob)item; if (blob.Name.CompareNoCase(displayName)) { string contentType = String.Format( "application/{0}", Path.GetExtension(displayName).TrimStart('.')); // No need to dispose, FileStreamResult will do this for us. Stream stream = new MemoryStream(); await blob.DownloadRangeToStreamAsync(stream, null, null); return File(stream, contentType, displayName); } } } return RedirectToAction("Index", "Tools"); } } return new HttpStatusCodeResult(HttpStatusCode.ServiceUnavailable); } ``` This downloads the file from the blob storage fine, but when the controller returns to the view using `FileStreamResult`, the browser is launching the save file dialog as expected but the file size is 0 bytes. The `Stream` shows that the correct file size, but when I do ``` return File(stream, contentType, displayName); ``` the data does not seem to be passed to the save dialog. How can I get the file to save properly? Thanks for your time.