Snapchat's My Story feature allows you to create a narrative out of your favorite snaps. As you already know, messages sent with Snapchat app are automatically deleted once they have been viewed, but the "My Story" feature changes the rules. Snaps added to My Story have a lifespan of 24 hours and can be viewed an unlimited amount of times.
How To Add a Snap to Your Snapchat Story
Open Snapchat and a record snap (photo or video). Once done, tap Next to move to the Send to menu.
Now, tick the My Story checkbox. A confirmation dialog that reads Add To Your Story</ital> will be displayed. Tap <bold>Add to add the selected snap to your story:
Repeat the operation to add more snaps to your story and create a narrative. You can swipe left on the Snapchat camera screen at any time to view your story: