Editing Sent Messages on Apple Watch

Hi 75x,

Thank you for using the Apple Support Communities! That's a great question. You would not be able to use this feature on your Apple Watch as noted in the following guide:

Unsend and edit messages on iPhone

To unsend or edit text messages, you must be using iMessage with iOS 16 or later, iPadOS 16 or later, or macOS Ventura. If your recipients have devices with earlier versions of iOS, they receive follow-up messages with the preface “Edited to” and your new message in quotation marks. SMS messages can’t be unsent or edited.

Hope this helps!

Have a great day.