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The identifier "83ED76EE-FBE5-47AD-B6EC-269D5C15355B.png" follows the naming convention for a locally stored image on an Apple device (typically from the Media/DCIM folder) or a file uploaded to a specific cloud session.

iMessage saves drafts within the specific contact thread. You can also use third-party tools like the Drafts App to manage more complex message templates. Mysterious Draft Text Msg | DroidForums.net

Some users report that third-party chargers or software bugs can cause the phone to "ghost type" or save empty messages as drafts. How to Manage Draft Messages

You likely typed a message but didn't hit send before exiting the app or switching to another conversation.