By Greg Bensinger, Diana Novak Jones and Jonathan Stempel OAKLAND, California, Aug 25 (Reuters) - The top executive at Instagram said few teenagers used a key safety feature to limit their use before it was turned on by default,

To use First Draft, Instagram says you just need to select clips from your Reels Gallery and tap "First Draft." The feature then analyzes your clips, trims them appropriately and then lays your clips out in a timeline where you can play them back.