docs: def FileTransfer(*args, **kwargs):
      """Factory function selects the proper SCP class and creates object based on device_type."""
      if len(args) >= 1:
          device_type = args[0].device_type
      else:
          device_type = kwargs["ssh_conn"].device_type
      if device_type not in scp_platforms:
          raise ValueError(
              "Unsupported SCP device_type: "
              "currently supported platforms are: {}".format(scp_platforms_str)
          )
      FileTransferClass = FILE_TRANSFER_MAP[device_type]
      return FileTransferClass(*args, **kwargs)