Why does MMS split multiple-picture texts into multiple texts?

[Android Central Question]

When I attach multiple pictures in MMS, it looks like it's attached all of them, but I hit "send" and it splits the text into however many pictures I attached. For example, if I attach 4 pictures at once, it looks like it's all grouped together, but after hitting send, it splits them up into 4 separate texts, and the person I'm sending it to receives 4 notifications, one for each text. Now they take a long time to send, often over a span of 20 minutes or so, and are less likely to go through at all now. This problem just showed up and has never happened before. I haven't changed any settings recently, and I have reset my phone multiple times (not a full factory reset, I'm hoping I can avoid that). The phone is an Android 6.0.1.

 

[mustang7757]

Which phone and message app?

'll leave a Link to register so you can communicate here as a guest account you can only post questions but can't reply.

https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

Welcome to Android Central! It might have to do with the maximum attachment size per message -- most carriers have about a 1 MB limit per message.

 

[methodman89]

What is your setting pictured here?

 

[62299]

It's an SM-G550T2. I didn't install a different app, it's just the standard Messages that comes with the phone.