How does happymod install obb files?

An OBB file is an expansion file used by some Android apps distributed via the Google Play online store. It contains data not stored in the application's main package (.APK file), such as graphics, media files, and other large program assets, due to size constraints (typically stored in a device's shared storage folder). Google replaced OBB expansion files with the Android App Bundle (.AAB) format in August 2021.

If the mod downloaded in happymod contains an obb file, it will be automatically bundled into one file. Users who need to install such a mod do not need to download the apk and obb separately, but can directly download and install it with one click.