I just installed 3.5.0 on the Fire TV Stick 4K.
Internal or external subtitles do not auto-load/auto-enabled; I have to manually enable them for each individual video.
The "Auto Load subtitles" in general settings is enabled. Is this feature not supported or I'm I missing something? In other players that I have tested, this feature works so that the subtitles are automatically enabled for all videos that have internal or external subtitles available without having to manually enable them for each individual video.
Everything else seems to be working fine.