Discussion about a Story can take place in the Comments & Attachments section of the Story dialog. The comments field supports text, markdown, emoji, files, links, and code snippets. Clicking into the comment text area will provide you with numerous helpers.
If you happen to close a Story without saving your changes, your changes will be automatically saved.
The system will share a message informing you of this
and the Story card will have a pencil icon indicating that the Story has unsaved changes.