@Indonesia You can now get versionCode with v3.4 using getAppVersionCode function;.

You can use enableShowBannerAd JS API to show/hide banner on specific page with version 3.4.

Announcing a new release v3.4 Pro.

Changelog (Added Features) in v3.4 Pro
Latest API Level 28
Better handling for SSL related errors
Updated Firebase and AdMob library versions
Fix Audio Play Bug
Overview mode enabled along with Desktop mode.
Push notifications automatically expandable when description is longer
Cookies now work with offline files too
JS API to show/hide AdMob banner on selected pages
JS API to get package name of App
.Webapp project now saves permissions, push config and progress wheel also.
**Bug Fixes

https://websitetoapk.com/download.html

Did you created an offline app using html files?

Yes, Of course, your app will get published on Google Play only when you publish it.

Better you can debug to get exact issue:
https://websitetoapk.com/docs/debugging-with-chrome.html

As a web developer you must understand that external data and content requests are never cached as data on server can be changed. Everything is working correctly, you're expecting too much to be done just with available caching option.

@JOHNNY inside We will be releasing an update with latest API Level 28 before deadline of 1st August.

Kindly raise a support ticket with your registered email on link below:
https://websitetoapk.com/support/submit_ticket

You can so the same by editing your WordPress theme using theme editor. You won't be able to do that in case you have no access. In future releases, we might implement a swipe-to-refresh feature.