Macromedia flash professional 8 sound issue

I'm trying to make an animation like Domics. If you skip to 4:15 in this video:
https://www.youtube.com/watch?v=tMWiYIVoDis

you will see that the sound he added appeared in his timeline, so he knows which frame matches to the audio. When drag my audio from my library and into my frame it remains in the library, but when I click "play" it will play my animation with the sound in the background.

How do I make it so it will show me the audio clip in the timeline? Is he using a different version of Macromedia? Are my settings funky?

I'm also using the free trial version, so maybe they do not give you the option to view audio clips in the timeline. Though that would be stupid.

Thanks in advance!