Here's how it works:
1. Tap at the bottom of the screen, then take or upload a photo or video
2. Add effects, filters, a caption or your location
3. Go back to the filtering and editing step, then tap the back arrow in the top left
4. Select Save Draft at the bottom of the screen
The function has a range of benefits and can be utilised beyond simply allowing everyday users to take more time to carefully craft their perfect post. Read more here.