The reason is that Facebook does not leave a copy of an unsent message on your account.

You can see unsent messages on Messenger basically through notifications. This article has helped identify how you can do exactly that. However, seeing how to see unsent messages on Messenger seems quite challenging for many users. It has a feature that allows users to unsend messages. Messenger is a resourceful instant chat app. However, you can remove a message by picking the Unsend for You option. If you choose Unsend for Everyone, you and the recipient will not see it again. The difference between the steps is that once you request to unsend a message, Messenger will ask you if you want to unsend it for everyone or you alone. Tap and hold the message you'd like to unsend or remove then, you can choose either one from the prompt. Steps to Unsend or Remove Messages on Messenger The recipient can still see the message because it has only been hidden from you. However, when you remove a message on Facebook Messenger, only you (the sender) will not see the message again. The app will completely remove it from the chat for both of you. The difference between the two is that when you unsend a message, you (the sender) and the recipient will not see the message again. This bonus session shows the difference between the two. There is a difference between a user unsending a message and removing it on Facebook messenger.

Bonus Tips: How to Unsend or Remove Messages on Messenger

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