Monaca LocalKit 2.2.1 can't upload
Upgraded LocalKit to 2.2.1 and choosing “Upload” or “Remote Build” displays an empty Alert.
I already tried deleting the file “local_properties.json” as per https://community.onsen.io/topic/1246/monica-localkit-2-2-0-not-working-on-windows but that did not help.
I tried with my own project and it worked fine with Localkit 2.2.1. You might have done something wrong to your project. I suggest you send a support ticket and provide a copy or more information of your project to them.