new_contents: import os
  
  copied_list = os.listdir('/media/secure_volume/output/')
  
  hold_list = os.listdir('/media/secure_volume/holding_folder/')
  
  miss_list = []
  
  for item in copied_list:
      # print(item)
      if item in hold_list:
          continue
      else:
          miss_list.append(item)
  
  print(len(miss_list),'files not extracted.')
  
subject: Add files via upload