I have both an android tablet and an iPhone but primarily use my iPhone or Macbook Pro.
Some file types are not supported when streaming on my iPhone such as *.mkv. In the android version, the app allows you to use VLC as the pass-through player so all videos are supported. I have seen other players that support this plugin and allowing the native player to decode the movies through the native app.
Can you please look into implementing a better media player/integrating better codecs?
A macOS app would also be much easier than using the WebAccess when remotely accessing the items.