It's not currently possible to automatically capture Instagram Stories or Reels posts by uploading the URL of the post as online coverage.
There are some third party tools available like https://www.storysaver.net/ which will download a post/story as an MP4 file. These can be uploaded as playable media files to your reports as offline coverage items. Alternatively its also possible to upload screenshots as offline coverage.
if you have any questions on this please get in touch and we'd be happy to help.