code: def upload_object(self, instance, bucket_name, object_name, file_obj,
                        content_type=None):
          
          url = '/buckets/{}/{}/{}'.format(instance, bucket_name, object_name)
          with open(file_obj, 'rb') as f:
              if content_type:
                  files = {object_name: (object_name, f, content_type)}
              else:
                  files = {object_name: (object_name, f)}
              self._client.request(path=url, method='post', files=files)
docs: Upload an object to a bucket.
  
          :param str instance: A Yamcs instance name.
          :param str bucket_name: The name of the bucket.
          :param str object_name: The target name of the object.
          :param file file_obj: The file (or file-like object) to upload.
          :param str content_type: The content type associated to this object.
                                   This is mainly useful when accessing an object
                                   directly via a web browser. If unspecified, a
                                   content type *may* be automatically derived
                                   from the specified ``file_obj``.