Import existing APK file into Appgyver

Hi, I have an existing App but I want to add more functionalities, can I import the APK file into Appgyver and customize it?
The actual APK compile on Phonegap for Android and on Monaca for iOS.
I also have the individual files of the APK

This is not something you can do, If you have the source this apk is built from you can try to reimplement it all with the composer.

how do you import an android apk?