Convert MP4 files to MP3 files on Articulate

I have used Articulate Replay to record audio, so that I can edit, save, and document the files, instead of recording into the Articulate Rise 360 courses directly. However, I only see the option to save the files as MP4 files or to publish them directly as videos into the courses... I would like instead to convert them to be MP3 files to add as audio into my Articulate 360 courses. I am aware of a way to use external programs to do this, but is there an easy way to do this somewhere within one of Articulate's offered apps / programs? Thanks for the help in advance.