Write an Android APK Expansion Files

I built an android App using Intel XDK (Music playlist) and the result is 220 MB APK file and as google allows only 50 MB the patch has to be Expansion file info is here [login to view URL] there is a plugin i think which can do that but i am lost : [login to view URL] what i want to do is that all is that all the songs has to be in a separate expansion file . the main file has to be 50 MB or less . Please only if you are familiar with intel Xdk and expansion files ! Thanks