微信机器人代码，群聊中多张图片无法完全保存

@itchat.msg_register(itchat.content.PICTURE, isGroupChat=True) def download_files(msg):

msg['Text'](msg['FileName'])

itchat.send('@%s@%s'%('img' if msg['Type'] == 'Picture' else 'fil', msg['FileName']), msg['FromUserName'])
return '%s received'%msg['Type']

进行测试后，群聊中发送 8 张图片也就保存下来 3 张