def upload(file)
      # get the path for upload
      response = Atlas.client.get("#{url_builder.box_provider_url}/upload")

      # upload the file
      upload_url = response['upload_path']
      Excon.put(upload_url, body: file)
    end
def upload(file)
      # get the path for upload
      response = Atlas.client.get("#{url_builder.box_provider_url}/upload")

      # upload the file
      upload_url = response['upload_path']
      Excon.put(upload_url, body: file)
    end
Upload a .box file for this provider.

 @param [File] file a File object for the file.