Hi there,
I’m a contributor on the Korean language course - 재미있는 한국어 4 Fun Fun Korean 4. I’ve been adding audio files to the existing words and definitions. So far I’ve added audio to 5 of the 15 levels. On the Memrise website the audio works, however when I try learn those levels in the android app only 3 out of the 5 levels play audio, the other 2 don’t. Furthermore I pay for a Memrise subscription, but I can’t seem to be able to use the ‘Listening Skills’ function on the android app, even though I’ve added audio, which is supposed to be unlocked if I subscribe. Please help me 
Thanks a lot!
Okay so I reinstalled the app and logged in and out, that seems to have fixed the audio synchronization problems. But the "Listening Skills’ function still isn’t appearing.
I think you might be interested in this post:
http://community.memrise.com/t/no-listening-skills-on-decks/41456?u=lucasheber
Listening skills won’t be available anymore for user made courses. So, don’t bother trying to activate it in your courses now. The frustration of having it taken away after you had activated it will be greater, I believe.
On the other hand, paying for something that you can’t access is still frustrating. That’s MemRise for you.