code: def thumbnail(self):
          
  
          if not isfile(self.thumb_path):
              self.logger.debug('Generating thumbnail for %r', self)
              path = (self.dst_path if os.path.exists(self.dst_path)
                      else self.src_path)
              try:
                  # if thumbnail is missing (if settings['make_thumbs'] is False)
                  s = self.settings
                  if self.type == 'image':
                      image.generate_thumbnail(
                          path, self.thumb_path, s['thumb_size'],
                          fit=s['thumb_fit'])
                  elif self.type == 'video':
                      video.generate_thumbnail(
                          path, self.thumb_path, s['thumb_size'],
                          s['thumb_video_delay'], fit=s['thumb_fit'],
                          converter=s['video_converter'])
              except Exception as e:
                  self.logger.error('Failed to generate thumbnail: %s', e)
                  return
          return url_from_path(self.thumb_name)
docs: Path to the thumbnail image (relative to the album directory).