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? How many items can you register in a course? What is the iKnow! study mode? Any Japanese grammar/JLPT related courses? Can I reset my study data? Comments 0 comments Article is closed for comments.