Let’s face the truth: the standard file manager on your Android phone, including Google Files, is just not good enough. While ...

These come in the form of Android Package (APK) files that contain an individual app and can be installed on your phone if not available on the Google Play Store.

Usually, this is done via APK files. APK files are Android installer packages downloaded from the internet, and they're often provided by third parties like websites dedicated to hosting the files.

Google looks like it's working to give Android backup a new option to preserve the files you download with apps like Chrome.