Is there anyway to distribute an application strictly to internal users? Meaning only to my organization. This is helpful for apps that will be internal forever but also helpful for apps that will some day be on the Appstore but need a long list of testers. I am aware I can email people APKs but having a feature like Google Play has to help with this distribution and automatic updates would be hugely helpful. Sharing one APK for Fire Phone and a separate one for other Android devices will get difficult to manage over the course of a project, especially when several users have multiple devices.