Can't send picture messages

I've had an AT&T S8 for about 9 months. I usually just use the default messaging app, but switched over the summer because the native app would not send/receive messages in order if sent in quick succession, which made reading conversations difficult if I didn't see them as they happened.

However, any other texting app I've tried will not send photos or videos. Group texts work fine, so it's not all MMS messages. If I switch back to the native app, I can send the picture, and then when I...

Can't send picture messages

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