Why am I getting a message saying “this channel layout is not supported” when I upload? You’re probably getting this message because you’re uploading a surround file. LANDR only accepts stereo files (2 channels). Check out our upload guidelines for more information. Related articles Why won’t my track upload? Upload guidelines Why am I getting a 'track too loud' error message? I paid for my master, why isn’t it in my library? Why can’t I get to the mastering preview?