微信又更新了！撤回消息有大变化

Group 1 - The WeChat message recall feature has been updated to include a new option for users to "recall all messages sent in this session" in addition to recalling individual messages [3][5] - This new feature allows users to efficiently recall multiple messages at once, addressing the issue of mistakenly sending multiple messages and the difficulty of recalling them one by one [5] - Currently, this feature is in a limited testing phase and is available to only a small number of users [6] Group 2 - Different types of messages have varying recall time limits: text messages can be recalled within 2 minutes, while files such as Word, Excel, PPT, PDF, MP3, and compressed files can be recalled within 3 hours [8] - Users can send images in a way that allows for recall even after 2 minutes by sending them as files, which can be recalled within 3 hours [9][13]