We're trying to migrate Realm from 1.x to a 2.x version. Do we need to provide migration in this case? We would like to keep the data obviously, but I think Realm deletes it if you update the app now. We havent released the 2.x version yet so now we need to deal with migration.
The Realm should be migrated automatically to the new format going from 1.x to 2.x since the file format changed.
https://blog.realm.io/realm-java-2-0-mobile-platform-support/