Probably every adult had trouble when in haste sent a text message was written incorrectly. Some popular messengers allowed to delete sent messages, but then the user has to type it again. Soon WhatsApp solve the problem by the introduction editing outgoing messages.

If your partner had not yet read message, then he does not know of the existence of errors.

Importantly, users will be able to remove or edit not only ordinary text messages, but also sent multimedia data.

Currently  a new feature testing, and while it is unknown when it becomes widely available.