Alamofire: Как показать прогресс загрузки multipartFormData?

Я знал, что могу сделать это для обычной загрузки:

let fileURL = Bundle.main.url(forResource: "data", withExtension: "zip")

Alamofire.upload(fileURL!, to: "http://localhost:3000/upload")
    .uploadProgress { progress in // main queue by default
        print("Upload Progress: \(progress.fractionCompleted)")
    }
    .responseJSON { response in
        debugPrint(response)
}

Но как мне показать прогресс загрузки multipartFormData?

Alamofire.upload(multipartFormData: { (multipartFormData) in
  let path = "\(Bundle.main.resourcePath!)/images"
  let all = try? FileManager.default.contentsOfDirectory(at: URL(string: path)!, includingPropertiesForKeys: nil, options: [])

  let filtered = all!.filter { $0.pathExtension == "jpg" }
  for item in filtered {
      let url = URL(fileURLWithPath: item.path, isDirectory: false)
      multipartFormData.append(url, withName: "photos", fileName: url.lastPathComponent, mimeType: "image/jpeg")
  }
}, to: "http://localhost:3000/upload") {
  (encodingResult) in
  switch encodingResult {
  case .success(let upload, _, _):
      upload.responseJSON { response in
          debugPrint(response)
      }
  case .failure(let encodingError):
      print(encodingError)
  }
}