What I'd like to do is to put a button in my app (in a developer dashboard) that my testers could press on and it would check to see if they have the latest build and if not, download the latest build from Fabric/Crashlytics. Is there such a thing?
When a tester launches an app distributed via Fabric Beta a check is automatically made to see if a new version is available. If there is, a notification is shown and the tester has the option to download the latest build. There isn't a mechanism that lets users check for an update manually within your app.