Keynote - audio files

I've created a Keynote presentation consisting of 46 slides (designed using Canva Pro). I created 46 separate mp3 files to narrate those slides (using Audacity), and now I need to bring it all together. I can add each separate mp3 to each separate slide, but I need to have those narratives play automatically, because I'll be hosting the course on Teachable, and I don't want my students to have to click a separate link to play each individual audio file. Can any one point me in the direction of a concise tutorial to show me what I need to do? The help files on Keynote weren't specific enough, and those on Teachable were way to general to be helpful. Thank you so much for helping!