WazzapMigrator is compatible with Samsung S9 before its launch :D ref. https://www.wazzapmigrator.com/changelog/2017-08-18-000000/android-o-compatibility  
Unfortunately WhatsApp just released a new bugged version (2.18.9) that doesn't restore from local backups, like the ones created by WazzapMigrator and WhatsApp itself. In order to fix this: just install WhatsApp 2.17 as explained in here.
New WazzapMigrator 3.2.6 gives you the ability to hide or show WhatsApp images from the Android gallery! Just remember to restart your phone after.
WazzapMigrator 3.1.30 fixes some issues when using ChatStorage.sqlite from Dropbox or OneDrive. Thanks to all the users who reported the issue!
WazzapMigrator is now able to import both enter and exit group statuses!