code: def _verify_file_size(self):
          
          if self._file_size > PartSize.MAXIMUM_OBJECT_SIZE:
              self._status = TransferState.FAILED
              raise SbgError('File size = {}b. Maximum file size is {}b'.format(
                  self._file_size, PartSize.MAXIMUM_OBJECT_SIZE)
              )
docs: Verifies that the file is smaller then 5TB which is the maximum
          that is allowed for upload.