There is no maximum file size, but .mp3 files tend to process smoothly and more reliably than .wav files. We also recommend keeping file lengths under 90 minutes, otherwise it can cause delays in the system.
Still having problems?
If you're willing to share info about your browser and the file(s) giving you trouble, it will help us out a lot. Email us with the size and file type of the audio. If possible, include a link to the item and the name of the file. You can also email our help desk at email@example.com.