BlankOk, make sure you get the whole link on one line--it ends with .mp3.
When I sent this a bit ago, it apparently sent the name of my stationery blank in front of the link, which should begin just with https:
https://dl.dropboxusercontent.com/u/93478912/Spark%20Talking%20hd%20radio.mp3
Steve, K8SP
Lansing, MI