Bit Perfect Music playback on iOS

I use an AudioQuest Red Dragonfly with my iPhone and unlike the Onkyo app it appears Plex doesn’t support bit perfect playback. So for example 96khz/24 bit flac files are transcoded to 48k

I noticed the downsampling issue in iOS and Android. We need an option to “disable” audio transcoding/downsampling. Music Quality settings don’t do the trick.