I recently migrated a story map developed using the classic "Shortlist" template to the new (2nd generation) story map service using the Map Tour immersive block. I was really impressed with how stable and clean the new builder was. Afterwards, I found this tutorial for creating the map tour by pointing to an exhisting hosted point feature service that has the images included as attachments. When I tested it, it worked after some troubleshooting with Esri, but I noticed that the same options for photo attribution and alternate text were not available.
Illustration of image options available in data-driven and manual creation map tour workflows.
I think having the photo attribution available in the data-driven map tour is an important feature because I believe it is implemented in a cleaner way than including the photo attribution in the main content window. I think having the alternate text option is also important for promoting the accessibility of the story map. Please consider adding these features to the data-driven story map workflow.