The app also doesn’t expose the edit history to the receiver of the message. Instead, the app simply shows a small “edited” icon so the user is aware the message has been edited.

When you finish creating your icon, use the Area Select option on the toolbar to select your icon. Next, click on Copy and then click the Close Icon Editor button.

Edited tweets will have an "edited" icon next to them, and others can click to see previously published versions of that tweet. Edited tweets will also keep all past engagement.