In Message + app, after sending a picture through text & it being seen & reviewed by the recipient, later (sometimes days or weeks later) I will get the exclamation triangle informing me it was not delivered when I know it has been. This has happened on both my Galaxy 8+ as well as my Note 9. What is the solution?
Making sure your messages are properly delivered and you are getting the right information about them is a big deal. We don't want confusion over that. How often has this happened? If you click on the notification next to the actual message, what message do you get?