I am having similar issue. I click Upload to Cloud, Agree to terms and then load bar goes from 0 to 100% and… nothing happens. I should see it in my campaign editor, but it is not there (should I wait some time for it to update?). I used only sounds from Syrinscape moods (no custom sounds imported).
Set is called: DL:DoAT Solace (from: DragonLance: Dragons of Autumn Twilight Solace).