If you want to locate the APK files in your Android phones, you can find the APK for user-installed apps under /data/app/directory while the preinstalled ones are located in /system/app folder and you can access them by using ES File Explorer.
Where are APK files stored on Android device?
If you want to locate the APK files in your Android phones, you can find the APK for user-installed apps under /data/app/directory while the preinstalled ones are located in /system/app folder and you can access them by using ES File Explorer.