Upload audio error code 413?

I have a mp3 and the file size is 14.3 Megs.  The file uploads and then I get a server returned error code 413.  Not sure how to fix?

Hello Rerednaw, I'm sorry to hear that you're having issues with your uploads. To rule out possible issue,  please carefully work through these steps of our guide to  Solving Technical Issues : Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome  and  Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable  all  add-ons/extensions. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through all of the requested information in  Step 4 .  (Don't forget the complete Console Log! Thank you!