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How to install an APK from your Android device

You can also install APK files from your browser on your Android smartphone or tablet.

• Just open your browser, find the APK file you want to download, and tap it – you should then be able to see it downloading on the top bar of your device.
• Once it's downloaded, open Downloads, tap on the APK file, and tap Yes when prompted.
• The app will begin installing on your device. Simple.

Refer to https://www.androidpit.com/android-for-beginners-what-is-an-apk-file for more information or search Google about "how to install an apk".