error with Bluetooth
When I connect Bluetooth, the audio still plays through the speakers on both the tablet and the phone instead of playing on the headphones.
REP-AN00 Xiaomi Pad 6 OnePlus Ace 2 Redmi K60 Pro ...
By "audio" do you mean the media courseware (mp3, mp4, etc.) inserted in the room, or the voice from other's microphone?
The former does not handle speaker change event since it is not common to see a web audio player to provide this function. Actually Flat uses the library plyr which does not provide a direct way to call setSinkId. So unfortunately we have no way to provide a way to switch the speaker of the media courcewares. They will use the default speaker of the system (you can set the default device in your system level).
The later one switches speakers when new devices are connected, if you find this not working you can give use more details (like which OS and which device you're using) to help us reproduce it.
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