Action Details
Requirements and how-to articles for Snapchat's action:

Multi Snaps allow you to capture and send up to 60 seconds of video at a time.

You need this to get it done:

iOS or Android Mobile Device
A mobile device compatible with the official Snapchat app is required in order to create and send Snaps.
When in camera mode, press and hold the camera button to record a video Snap. Keep holding the camera button after the time runs out in order to automatically start recording another video Snap. Multi Snap allows you to record up to 60 seconds of video (up to 6 videos, each with a maximum length of 10 seconds.)
Caption (optional)
You can add a short caption to your snap.
Sticker (optional)
You can decorate your snap with stickers.
Send Snap
Choose where to send your snap.
Save to Memories (optional)
If you want to keep your Snap to use later in a Story or a Flashback Memory, make sure to save it to your Memories before sending it.
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How-To Articles
A list of useful links for you:

Snapchat Support - Send a Snap
Official guide on how to send a Snap.
Link missing here or found errors? Improve How-Tos