How to update system applications using StageNow?

Device: MC40

OS: Android Kit Kat

 

I would like to update AppGallery from 2.2 to 2.4 through StageNow. However I get an error installing the APK. Am I doing something incorrectly?

 

If I install the APK from the device itself, it works fine, but I'd like to avoid manual installation if possible.