Messaging app (not Hangouts) keeps trying to send MMS! Why do it do this?

A

AC Question

Messaging app (not Hangouts) keeps trying to send MMS!

(Android version 5.0.2)

I composed an MMS message (text+image) and tried to send it but it could not be sent for some reason (think it's down to MMS not enabled at carrier). Anyway, the message is now irrelevant as it was a birthday greeting. The problem is that now whenever I receive a text message from the person I tried to send the MMS to and I touch on the message notification on the running app to see their message, the birthday message I was trying to send comes up and I can't bypass it. Why isn't there anything I can touch on to say I don't want that message sending anymore but to keep it nonetheless and skip over it so I can access composing and sending a new message to them? The best I can do is touch on send new message icon at the top of the screen and that works.
 

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