mp3 file for download is playing in new browser window

Hi All - in my Resources lightbox slide I have a link to an mp3 file. I need this file to be downloadable by the user (it's a cadence file for administering push up tests, etc.) but it's currently playing in a new browser window. Is there a way to make Storyline give the option to save the file similar to as if it were a pdf?

thanks very much

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