Hello Ernie, forgive me for my English, I am using the translator.
It turns out that I'm trying to download the videos on Android and they do not load, they take a long time. I have tried with different formats and versions of mp4.
The same videos are downloaded well on the iPad, but I have tested on my Xiaomi mobile and on emulators like Nox or Bluestacks and they are not going well.
I've also tried uploading the same files to google drive or my own hosting.
Could you check if the videos load well on your android? If yes, is there a video format that goes better with the application?
Thank you.
Ivan