On android when you just click "MAX" it changes to FLAC. When you press-hold it it gets you to the preferencesI forgot to say that on iOS version, if you touch the bitrate indication, it toggles with "Max" back and forth.
On android, touching "flac" badge, it opens streaming preferences.
In windows it opens the tab for Audio Quality where you see Max: up to 24bit,192Khz. But this is not clear what is the real streaming quality of the file playing