When we will have android pie for s7 edge

When we will get android pie for s7 edge .

why I am not able to watch mkv format video in my s7 edge....???when it's comparable with Mkv format file...

after full charging....2 hours using of phn...battery drain 50-55 percent....after 3 to hours battery balance is around 20 percent....very bad battery back up..waste of money...on buying s7 edge....poor phn battery....will not buy any Samsung phn.......