If you’re unable to download files or apps, the system service might be turned off. Follow these steps to reactivate it:
If you are trying to download and install an APK file from outside the Play Store, you must enable the permission for your browser or file manager to "Install Unknown Apps". How to open built-in download manager in android enable download manager android phone
: If the app is disabled, you will see an Enable button. Tap it to restore functionality. If you’re unable to download files or apps,