Selecting a cover image for sharing Storied experiences

Your first thumbnail of your first page is your default cover image used in sharing. To customize a cover image for public sharing (e.g., on LinkedIn or Facebook), open your Project Settings tab, go to the Sharing options section, and upload your desired image.

For private sharing (e.g., via email), your publish setting includes your default thumbnail which you can edit to select an alternate image.  Once you're happy with it, you can select copy and paste into your email, along with the link to the project.