For support issues, you can always use firstname.lastname@example.org, or the forums as well.
iOS showing a blank screen is generally indicative of an out of memory or video capability issue. In looking up that model of iPad, it looks to be released in 2014, and very well may not be capable of 360 video, despite having an updated OS. We do test quite thoroughly on iOS devices, and certainly have not seen issues with the Corals scenario.
Have you tried lower resolution videos, or perhaps 360 image scenes to see if they load on your iOS device?