You can download a CSV export of your Stories analytics under the PRO, ELITE, ADVANCED, MASTER, CORPORATE and AGENCY plans!

Stories, Reach, Impressions and more are available in the daily/weekly/monthly exports but aren’t yet showing on the scheduled reports.

You will be able to export this data in the Overview section of your main menu, select the option of your choice as shown below, you can also select the date on the Global date picker on the top right of the Overview page. Then just click on the grey arrow in order to start the download as illustrated below: 

Also know as "How to download my Stories data?"