My friend qq clearly said it, and when I went in, I said I didn't send it. Tell me what happened.

The first possibility, delay, two-minute refresh.

The second possibility is to delete it as soon as it is sent to the other party.

The third possibility is that the other party has set up the right to talk, which is relatively high. Not only the mobile QQ, but also the computer version, the computer version of QQ friends uploaded photos saying that there would be system messages, but there has been no access space, which is indeed correct.