Was the song downloaded to the phone or is located on the Google cloud? Songs purchased from the Google Play store reside within your Google Account on the server, you have to physically download the song to the phone after purchasing. The alarm app will only play local songs/tunes those that reside on the phone.
Once you have made sure the song is on the phone, the instructions kbelly provided should work.
If my post or someone else's answered your question please mark it an Accepted Solution.
Keep in mind, like you, I am a Sprint subscriber. I am in no way employed by Sprint in any sense. I just know stuff.
This is a PUBLIC ARCHIVE board, all artciles are read only.