Why can't I hear the music when using Unity objects to play the music?

Issue description

When using Unity objects like AudioSource and AudioClip to play the music on an iOS device, you may encounter the following issue:

• Being able to hear the music at first, but no longer hearing it after joining a channel.
• Being able to hear the music in a channel, but no longer hearing it after leaving the channel.

Reason

When you use Unity objects to play the music before joining a channel, the status of the system AudioSession is set to active. After you join or leave a channel, the Agora Unity SDK changes the status of the system AudioSession to inactive, which is why you cannot hear the music after joining or leaving a channel.

Solution

Before joining a channel, call mRtcEngine.SetParameters("{\"che.audio.keep.audiosession\":true}"); to keep the status of the system AudioSession as active. This ensures that you can hear the music, even after you join or leave a channel.