Hello GeoNet Community,
I posted this to the state competition geonet place, but I thought a T3G alum could help, too.
I'm hoping you can help me help a teacher in the competition. Please see her email below. If you have any guidance, it will be greatly appreciated.
1. I have never had a problem in Chrome changing any of the Map Tour images to a video. You have to use the EMBED code for the video rather than the actual full URL for the video. You can still use Picasaweb/Google Plus for the images, but Google messed up a good thing and so it is much more clunky than it was in Picasaweb, as I explain here: https://community.esri.com/community/education/blog/2017/02/17/photo-guidelines-for-arcgis-online-ma... ... in my photo guidelines.
2. You can use Vimeo and other formats in Cascades and Map Journals, but for Map Tours, I've only been able to use YouTube. The OTHER way to use other video though is to edit the CAPTION and put a LINK to the video there. It won't play INSIDE the story map but at least it will work.
I hope this helps. Thanks for being a story map champion.