Story Draft is a new feature from Instagram
Instagram Stories will soon get a new option to save unfinished stories as drafts. This feature will allow users to come back to their draft stories and complete them later if they wish to do so. While Instagram says that this feature is a work in progress, screenshots of how this feature may look have leaked online. The screenshots suggest that Instagram is working on a new pop-up that will allow users to either save their stories as drafts or discard them and start with a new story.