docs: def upload(self, *args, **kwargs):
          """Create package and upload it to NApps Server.
  
          Raises:
              FileNotFoundError: If kytos.json is not found.
  
          """
          self.prepare()
          metadata = self.create_metadata(*args, **kwargs)
          package = self.build_napp_package(metadata.get('name'))
  
          NAppsClient().upload_napp(metadata, package)