I always keep my playlist running in the YouTube music or Spotify and the song name and controls appear in the top panel when I'm working. But when I play a YouTube video in my browser, the player controls will change to the video that I'm playing right now.
The problem comes when I play the video and want to pause the music, I have to go to the respective source and not from the top panel since it is not showing anywhere. It will get changed once I open the music app window. Is there any way to show those multiple audio player sources in the top panel?
I have tried several extensions to achieve this but failed.
UPDATE: I just found that it happens when I use multiple audio sources within the same browser. I have to use the browser since there is no YouTube or YouTube Music software in the App Center.
It is because the audio source is from a single application (in your case the browser, even though you have installed the web-app). Currently, Ubuntu is unable to detect different audio sources coming from only one application.
You can try the same by installing the Spotify or normal Ubuntu audio player and will find multiple sources listed in the top panel.