Are you able to test again to see? We implemented a lot of changes for Android and still will be adding more this last week. If you have time, please let us know and will try to look more into it. https://github.com/VectorPrivacy/Vector/releases/download/v0.4.0/Vector.apk

I tried with the version from your link and the two buttons still don't do anything for me. I only see click animation, then nothing happens. Dunno if that's because of old android version or sth else completely. I can help with further testing if you need, just tell me what to do...