This modules adds a system config file in your system/etc/permission folder which enables the support of OneUI styled Google Message. Read more about it on - XDA
This module just make it easy to get updates directly Play Store without needing to install bundled apks from APKMirror every time Google Message gets updated.
There are some additional steps are needed to make it work.
- Flash the module in Magisk
- Clear data of Play Store and Reboot your device
- Open Play Store and Install the Google Message update.
Google delivers this specific design of Google Messages in the form of Split apks which are specifically built for Samsung devices. If you do not have root, you can just download the Bundled Apk from APKmirror and install it with any Split APK installer.