You cannot download or install APK files on iOS
APK files are for Android devices only
iPhone and iPad use IPA files instead of APK files
To get an app on iOS, use the App Store
If the app is not in the App Store, use the developer’s official iOS version if available
For testing or sideloading, use TestFlight or approved iOS installation methods
Avoid websites that claim to convert APK to iOS app files
Do not try to open APK files directly on iPhone or iPad