code: def save_preview(self, index, gallery, name):
      if len(gallery) == 0:
          return (
              self.get_card_html(name),
              "There is no image in gallery to save as a preview.",
          )
  
      item = self.page.items.get(name, {})
  
      index = int(index)
      index = 0 if index < 0 else index
      index = len(gallery) - 1 if index >= len(gallery) else index
  
      img_info = gallery[index if index >= 0 else 0]
      image = generation_parameters_copypaste.image_from_url_text(
          img_info
      )
      geninfo, items = images.read_info_from_image(image)
  
      images.save_image_with_geninfo(
          image, geninfo, item["local_preview"]
      )
  
      return self.get_card_html(name), ""
  
imports: import datetime
  import html
  import json
  import os.path
  import gradio
  from modules import generation_parameters_copypaste, images, sysinfo, errors, ui_extra_networks
label_desc: Use image node_id 15 for calling the UserMetadataEditor obj's underlying member method code with example usage: obj.save_preview(index, gallery, name) and returns: self,  str, self,  str