320k MP3, which are the files downloaded by DJs when you send your promo, is automatically created in the LabelWorx system when you upload a WAV file.
If you do need to create or update a 320k MP3 for your Promo, follow these steps:-
1. If you have not already done so, upload your WAV files to your release.
2. Click the Make 320k button on the icon menu on the Mix Details page
Note - If you don't see the "Make 320k" button on the "Mix Details" page then click the "Apply" button on the icon menu and it should appear if you have uploaded your WAV files.