In properties we can upload html file
On webviewer error connection
on page not found
etc.
expecting in next update
May be their is some with your blocks
use connectivity component to check if the device is connected to internet, if not show your page
want inbuilt feature without confusing blocks
It will be confusing on big projects
The component which check connectivity is in built feature of component named “Web” which is inbuilt component of Kodular