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

Requirements
You need this to get it done:

Photo Snap
When in camera mode, tap the camera button to take a photo Snap.
Video Snap
When in camera mode, press and hold the camera button to record a video Snap (up to 10 seconds long.)
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.
iOS or Android Mobile Device
A mobile device compatible with the official Snapchat app is required in order to create and send Snaps.
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.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

0
Snapchat Support - Send a Snap
Official guide on how to send a Snap.
Official
Link missing here or found errors? Improve How-Tos