Note to self, keep the iPad in the portrait position so you don't have to look at videos sideways!
Size of the video file seems to be an issue too. Under 100MG works great!
This original video was larger than 100MG but I used Handbrake to convert it to an MP4 video which got it below the size limit! Handbrake is a program that can be installed on teacher machines. It is in the Kace software librbary but I had a tech person install it for me.