How to send 1 snapchat with more than one picture?

I was snapchatting a friend on my iphone and i opened up 1 snap chat message that showed 2 images back to back. How do i go about sending a snap chat like that; specifically one that allows the receiver of my messages to have it play through 2 messages without having to open 2 separate messages?

This is part of the new snapchat update, sending 2 messages back to back will show in 1 button now

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Um, usually they don't have to anyway.

If you send someone two snapchats and they don't check the first one before you send the second, then both will appear as one longer snapchat with pictures back to back.