You need to set up your device to appear as a USB debugging target, rather than a USB Mass Storage device. We have an article on this in our docs
, but if it doesn't work out for you - feel free to ping us any time and we'll be glad to help.
Also, Graphite automatically deploys changes to your app on the device - just click save and the modified file will be transmitted over the cable and the app will be refreshed. It's a lot faster than always building a new APK and installing it. Actually, if you click Run On Device after your app is deployed, Graphite will save any unsaved files and transmit the changes, instead of rebuilding from scratch.