AVPlayer 'Auto(Recommended)' option for subtitles

I use HLS to play video in AVPlayer. My .mp3u8 file has following content

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA:TYPE=SUBTITLES, DEFAULT=YES,GROUP-ID="subs",NAME="English",LANGUAGE="eng",URI="some/path"
....

There is 3 options for subtitles "Off", "Auto (Recommended)", "English" on the screen. By default "Auto" option is chosen in the player, but there is no English subtitles are displayed (phone language is English).I have tried set FORCED attribute to YES but it does not help(subtitle icon become hidden). I have 2 questions:

  1. Is it possible to display subtitles when user selects "Auto option"?
  2. What criteria is used to determine subtitles language or subtitles visibility?

+1

Bumping this one up due to the lack of official docs. What's the behavior for Auto (Recommended)?

Feedback created: FB13344652.

AVPlayer 'Auto(Recommended)' option for subtitles
 
 
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