if (!gcs_file->outfile)
    TF_SetStatus(status, TF_INTERNAL,
                 "Could not append to the internal temporary file.");
  else
    TF_SetStatus(status, TF_OK, "");
}

int64_t Tell(const TF_WritableFile* file, TF_Status* status) {
  auto gcs_file = static_cast<GCSFile*>(file->plugin_file);
  int64_t position = int64_t(gcs_file->outfile.tellp());
  if (position == -1)
    TF_SetStatus(status, TF_INTERNAL,