Can I add an audio file to recording?

Hi I am making a greenscreen video but want to add a music track separately so need to turn off sound from the camcorder and add a song from my laptop…how can I do this please? I have tried adding audio sources and it adds the track to sources but won’t let me add it as a layer. Thank you

You need to use the “Audio Only” layer. This layer don’t have a visual representation in the live output but only plays back audio content on demand.