When you go to the sound or musical note icon in the top right, click on that, at the top have you got the option to search for a soundset?
I think you need to search in there then import to your world before you can play what you want. Although technically it’s not importing it’s just linking to Syrinscape web player.
Do this without Syrinscape open in another tab.
Also have you updated the Syrincontrol module to the latest version.