add audio in Single choice question in course presentation

Hello,

don't ask to ask, just ask is something I have to remind myself again and again.
I was planning to include a single choice task within a course presentation. Actually, my thought was that I wanted to include an audio output outside of this task, which would have had to be decided. Then I saw in the preview under Lumi that single choice also contains a loudspeaker symbol. Unfortunately, I didn't see the option to add an audio file anywhere in the edit mode.
Can someone please show me where this is possible.
Regards Villon