Thank you but my problem is not how to upload the new version. It's how to import it into XDK without creating a new Project.
See, i made Version 1.1 of my app, exported it from C2, imported it into XDK, did the app settings, build and uploaded it. Everything went great and i could test it on different devices. Now, after some feedback, i made Version 1.2 of my app with some fixes and stuff. I exported it from C2 and then comes my problem.
I want to update the XDK project with the version 1.2 but can't figure out how. The only way i see is deleating the old Project and importing a new one. But thats realy inconvenient cause i'd have to do the appsettings again for each version.