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Before you can install the APK, you must allow your file manager (or the browser used to download the file) to install unknown apps.
The first person to encounter this problem was a well-meaning but not particularly tech-inclined elderly lady. She had been trying to install an app on her Android device to video chat with her grandkids, but every time she tried to download an app, she was met with the frustrating message. Before you can install the APK, you must
Tap the file. If your phone asks for permission to "Install from unknown sources," toggle that setting to Finish Setup: and wait for the "App Installed" message. Try Again: Tap the file
Next time an APK won’t install from a notification or a web link: : Android's "Unknown Sources" security policy and Xiaomi's
(also known as DeviceDiagnostics), a Xiaomi-developed system tool used to enable for IMEI repair, QCN reading/writing, or hardware testing. : Android's "Unknown Sources" security policy and Xiaomi's MIUI/HyperOS Optimization