Using Interface Maono - Podcast

Good Evening,
I am using my Interface Maono to record my podcast. There is a music input that I can connect my iPhone to the Maono Interface so I can play music and record it. When I record the first time, I played the music to record and it record in the track, I heard the music playing in my ear. Next when I record It let me hear the music in my headphone but when I look at the track, I didn’t see the waves making any movement. When I playback I don’t hear the music on the recording. Can you please assist me on helping. I watched all the audacity YouTube videos but I couldn’t find anything to help me.

I could try to pull up the manual on this one. Did you say which model?

AU-AM200
AU-AM200-S1
AU-AM200-S4
AU-AM200-S6
AU-AM100
AU-AM100-K1
AU-AM100-K2
AU-AM100-K4
E2
E2A

?