docs: def from_file(self, file_name=None):
          """Loads a DataFrame with all the needed info about the experiment"""
  
          file_name = self._check_file_name(file_name)
  
          with open(file_name, 'r') as infile:
              top_level_dict = json.load(infile)
  
          pages_dict = top_level_dict['info_df']
          pages = pd.DataFrame(pages_dict)
          self.pages = pages
          self.file_name = file_name
          self._prm_packer(top_level_dict['metadata'])
          self.generate_folder_names()
          self.paginate()