Can't view movies on my iOS devices

I’m not sure if this is the answer, but it seemed so simple, I’m embarrassed to even post it. All the videos play very nicely through the Apple Videos app on either my iPad or iPhone. I disconnected my device from the Wifi network and ensured the Videos app was empty. I then connected back to my Wifi network, opened the Videos app, and there were all the movies that are on My Cloud. It takes about 60 seconds to load the movie, but then it plays very nicely. I hope this helps. My expectations of the MyCloud app were way too high and my understanding of the interface was way too low.