Hi Owen,
Here is the link: https://storymaps.arcgis.com/stories/2411297810774ff28d3b6af7c5f0ac7c
After testing it a bit more, it seems like the video will display on Android devices after waiting a while to load. Before it loads a still image of the video is displayed. However, on iPhones, only a gray background appears instead of the video.
Additionally, when scrolling through a map sidecar, the map updates quickly on Android devices and is displayed at a large enough size to be useful, but on iPhones, the map does not update quickly, so it is easy for the user to scroll through the entire sidecar slides without having the map update at all. The map area also displays much smaller on iPhones, and it would be more useful if it maintained the same height that it does on Android devices.
All in all, it seems to behave differently across the different platforms.
