Split APKs Installer (SAI) 4.4 (Android 5.0+)

4.4:
• Fixed in issue where system suggested SAI when opening any type of file
• Added Sui support for Shizuku Installer

Legendary SAI update Pog
4.3:
• Support for opening .apk files via SAI
• APKM support (only for the unencrypted .apkm files)
• Installer Pro mode is now enabled by default
• Config splits shouldn't be marked as Unknown anymore
• Some fixes

4.2:
• Fixed an issue where you can't create a normal backup when single apk export is enabled

SAI is an advanced APK installer with split APK support. It also has simple app backup/export functionality.

SAI can install apps using standard Android API, using root access or using Shizuku.

SAI is an open-source app, you can get the source code on its GitHub repo - github.com/Aefyr/SAI

Please note that SAI only installs user-provided files and is not responsible for those apps behavior.
Please also note, that some devices/ROMs aren't supported by SAI, that has to do with bad Android API implementation in said ROMs and can't be fixed on app side.