Adding audio files in to cart without using wix products

How do I create the “add to cart” functionality on an audio file displayed in a repeater?

I am using wix editor and the drop down velo coding but I can’t seem to get this right.

Companies need to be able to add songs to their cart then select what licence they prefer then when they purchase the tracks it needs to automatically send them an email with the audio file plus song info plus licence agreement.

I have already tried using another dataset, meaning when they click add to cart icon it should submit track and track info to cart dataset which displays on the cart page in a repeater. This still does not work.

This should be fairly simple but everything I try doesnt even add any info to the dataset or display anything on the cart page.

I would really appreciate some help with this issue, Thank you.