This page will be updated with more info once the Beta is over...
Upload MP3 files
1. Click "Sets"
2. Choose and click the set that you would like to add music to
3. Click the "Soundtrack" tab
4. Click the "Add Media" button at the bottom of the right panel
5. Select the MP3 files and click open
6. Allow all the files to upload and click "Done"
HINT: If you see a red "Warning" alert next to your file, it might mean that the file is really large. It, doesn't necessarily mean that it will not play - but know that the file could load slow or not at all.