Create a new folder named 'assets' in app/src/main/ you can also right click > new > folder > assets folder.
Put your offline webpages in this folder.
Use the following url for the webview:
Where yourfile.html is a file in your assets folder.
Web Panel (Web2App)
If you use our web panel the flow would be as following:
* Use file:///android_asset/yourfile.html in your web panel as URL.
* Generate the template.
* After generating and opening the template in Android Studio.
* Now create a new folder named 'assets' in app/src/main/ you can also right click > new > folder > assets folder (if it does not yet exists).
* Put your offline webpages in this folder, make sure the pages match the url you entered earlier (in this case, a file in the root of assets named yourfile.html)