Help Please? – Lucid Dreamer Review

I love the layout of the app and the features. However I can’t get the main feature, which inspired me to buy the upgrade, to work... Every time I choose a custom audio track there’s the check mark next to the chosen track, I press “done”, and then the audio still reads/plays “default”. Can you please help? Thanks!
Review by ZLee28 on Lucid Dreamer.