Code snippets for Recording .mp3 audio in Google Add-ons/Google Apps Script to Google Drive https://mashe.hawksey.info/?p=17916

snip_02.js

blobToDataURL(blob, function(url){
   var filename = 'recording_' +
            (new Date()) +
            '_.mp3';
   google.script.run.withSuccessHandler(function(driveUrl){
     $('ol.convertedList')
            .append('<li><strong> ' + filename +
            '</strong> <a href="'+driveUrl+'" target="_blank">Drive Link</a><br/>' +
            '<audio controls src="' + url + '"></audio>' +
            '</li>');
   }).invokeSave(url, filename);
});