rails download file from url & create ActiveStorage::Blob

def remote_url_to_attachment(url, model, field)
  return unless url.present?

  tmp_file = download_remote_file(url)
  blob = ActiveStorage::Blob.create_after_upload!(io: tmp_file, filename: File.basename(url))

  # attach by model.field.attach
  model.field.attach(blob)

end