title: Swift upload multiple files parallel into AWS S3 and show progress view status in tableview cell
body: <p>I am new for AWS, I have done some file uploading into AWS S3 with TransferUtility file transformation. Here my scenario steps</p>
  
  <p><strong>1. Picking the files from iCloud</strong></p>
  
  <pre><code>public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {
  
          let fileurl: URL = url as URL
          let filename = url.lastPathComponent
          let file-extension = url.pathExtension
          let filedata = url.dataRepresentation
  
          // Call upload function
          upload(file: fileurl, keyname: filename, exten: file-extension)
  
          // Append names into array
          items.append(item(title: filename, size: string))
          self.tableView_util.reloadData()
  </code></pre>
  
  <p><strong>2. Upload that file into AWS S3 with transfer-utility</strong></p>
  
  <pre><code>private func upload(file url: URL, keyname : String, exten: String) {
   transferUtility.uploadfile(file ur,
          bucket: "YourBucket",
          key: "YourFileName",
          contentType: "text/plain",
          expression: expression,
          completionHandler: completionHandler).continueWith {
             (task) -&gt; AnyObject! in
                 if let error = task.error {
                    print("Error: \(error.localizedDescription)")
                 }
  
                 if let _ = task.result {
                    // Do something with uploadTask.
                 }
                 return nil;
         }
  </code></pre>
  
  <p><strong>3. While upload need to show each file uploading status into tableview cell</strong></p>
  
  <pre><code>func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -&gt; UITableViewCell {
  
          let cell = tableView.dequeueReusableCell(withIdentifier: "cellutil", for: indexPath) as! UtilityTableViewCell
          let item = items[indexPath.row]
  }
  </code></pre>
  
  <p>My Issue: The tableview I can able to show uploading items but first uploading stopped when I upload next one. I need to achieve parallel upload multiple files and show on cell status.</p>