Sngine comes with 3 web-view apps for FREE, but support policy not cover these FREE apps as we only sell Sngine script “PHP Script”
But you can customize the web-view apps as you want and you can find how from the documentation included or online from here
To change the Splash screen
Now to export the APK to Google Play Store?
As this beyond the support but you can check a lot of online tutorial and videos to learn more
Hope these info and tutorials help you well, and if you don’t have enough experience you can hire someone to do it for you with no problem https://studio.envato.com/
Happy Sngine 🙂