Love your player! Just struggling to implement the audio player into my Shopify site. I have followed the tutorial: https://amazingaudioplayer.com/how-to-add-an-audio-player-to-shopify/.
In the tutorial, step 2, you need to upload the files to the Public folder of your Dropbox.
Public folder is special folder in your Dropbox space, you can view the tutorial: https://www.dropbox.com/help/16/en. New Dropbox account does not have a default Public folder, you can follow the instructions in the above link to create one.