Immersive Section: Alternative Text for Views Not Custom

[yetiracing4als]

I have added an Immersive Section to my story map and would like to associate alternate text with the views that I am adding. I built my story map and added an immersive section that included 3 views with video. When I add the alternative text, and save each view the alternative text is still visible. When I save the story map and view it publicly the tags cannot be found when I search the code using Inspect tools in Google Chrome. You can see my working example here that the views no longer have alternative text associated with them.