docs: def update_contents(self, stream, seek=0, size=None, chunk_size=None,
                          progress_callback=None, **kwargs):
          """Save contents of stream to this file.
  
          :param obj: ObjectVersion instance from where this file is accessed
              from.
          :param stream: File-like stream.
          """
          self.checksum = None
          return self.storage(**kwargs).update(
              stream, seek=seek, size=size, chunk_size=chunk_size,
              progress_callback=progress_callback
          )