ModJoy APK and Install-Unknown-Apps Settings: Troubleshooting Questions to Consider

https://mobileapkroute.tearosediner.net/how-to-think-about-failed-apk-installations-when-exploring-mod-joy

Troubleshooting works best when you change one thing at a time and keep track of what happened. Install-unknown-apps settings control which sources, such as a browser or file manager, may start an APK installation