Galaxy Note 3 downloading mp3 attachments, but not finding the file in music player.

[AC Question]

Downloading mp3's from gmail on to my Galaxy note 3, but unable to open or find in any music playback app. Found only in downloads and files, but doesn't open file. When I downloaded an mp3 via gmail it says it was downloaded, but then I can't find the file in my music player. I have found it in my downloads file but it doesn't open to a music player. I can bring it up via preview and it plays just fine. What do I do to have these downloads saved directly into my music player?