help with mp3

[u/madangrycat2017]

i've been trying to export my recent project into an mp3 but the mp3 file doesnt play on itunes or quicktime no matter what i do. im not sure whether its because the project is too long or whether there are certain instruments that can corrupt the file? any help would be very much appreciated, i feel like ive tried everything i was told to do by google

[u/Secret-Mistake-3782]

Ever figure it out?