If we want to install apps outside of the Google Play Store on the OnePlus smartphone, such as .apk files, the appropriate file must be downloaded.

To do this, the browser app you are using must have permission to allow apps from an unknown source, which is a pure security measure by Android to protect against malware.

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Apps & notifications
Step 3:  Tap on  Special app access
Step 4:  Tap on  Install unknown apps
Step 5:  Choose an  app
Step 6:  Enable or disable  Allow from this source
  1. Open the Settings
  2. Tap on Apps & notifications
  3. Tap on Special app access
  4. Tap on Install unknown apps
  5. Choose an app
  6. Enable or disable Allow from this source

OnePlus Instructions
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