Play audio from cms track list url

Good day,
I am using the UXDan tutorial to play cms audio files. I have placed the files in Dropbox and copied the link to track url in my music cms. I got the code from w3 school, placed in embed changed the src to my track url cms and I can see the player fine but it doesn’t play when I publish it. I am wondering if I got the correct link from dropbox. Has anyone had this problem and solved it…or perhaps UXDan has the solution. Others on the tutorial page didn’t have this problem, and the tutorial is a few years old.
Any help would be greatly appreciated