SAI: Filepicker lib:

SAI (Split APKs Installer) is an Android app that lets you install split APKs (such as ones distributed as Android App Bundle). It has both rooted and rootless installation methods.

State of SAI

SAI is kinda dead cause I have no motivation for continuing its development. I will probably maybe still occasionally fix bugs and add small features/improvements, focusing on the installer functionality, but idk. If you're looking for an actual backup solution, you can try OAndBackupX or Swift Backup.

Contributing

Please read Contributing guide

Exported .apks files meta

SAI adds some meta information to .apks files it exports, you can find the description of the format it uses in the Meta format description

License

SAI is licensed under GPLv3