I know that for Fabric two separate apps are required for Android and iOS even though they can share common codebase (and so common event source) using Ionic/Cordova.
Was unable to figure out from the Firebase Crashlytics documentation if it is possible to combine the reports across iOS/Android and if not if this is considered for the future (I'd appreciate any tickets/threads on this)?
Whats interesting Fabric to Firebase migration documentation concerning organizing projects for Apple shows mainly Android apps on screenshots.