Hi! Since I’m not an expert on mobile phones, and I know there can be a lot of differences between devices, I ran a Google search to see if I could find some information about this.
From what I learned, the MPEG-4 (.mp4) seems to be a more universally accepted video format for both Android and Apple devices. That file format is accepted by our document library, so I would give that formatting a try. I hope this helps, and let me know if you run into any trouble!