Audio does not play .mkv files on iPad/iPhone any more - used to - Video fine

How can I request Sandisk to re-enable dolby audio codecs playback since it was supported in earlier versions. I purchased the wireless stick so that I can stream mkv files to my iOS device, asking users to re-encoding their MKV files is a pretty unreasonable request, I now can stream by connecting via VLC’s network stream but it’s tedious as hell and it just doesn’t work eligently.