Can I upload and use my own audio files? iKnow! Support Updated July 19, 2019 08:17 Follow As long as the audio files are in the mp3 format and less than 2MB, you can upload and use them in your custom courses. Related articles Why is the Start button not visible on my custom course? Any Japanese grammar/JLPT related courses? Can I share my custom courses with others? Can I reset my study data? What is "Contract Renewal Bonus"? Comments 0 comments Article is closed for comments.