Load document from Amazon S3 Storage

 		string key = "sample.docx";

        using (Viewer viewer = new Viewer(() => DownloadFile(key)))
        {
            HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources();                

            viewer.View(viewOptions);
        }

		public static Stream DownloadFile(string key)
        {
            AmazonS3Client client = new AmazonS3Client();
            string bucketName = "my-bucket";
            GetObjectRequest request = new GetObjectRequest
            {
                Key = key,
                BucketName = bucketName
            };
            using (GetObjectResponse response = client.GetObject(request))
            {
                MemoryStream stream = new MemoryStream();
                response.ResponseStream.CopyTo(stream);
                stream.Position = 0;
                return stream;
            }
        }