and thanks for the low-threshold support possibility via forum. I would like to ask if there is any end-user documentation on how to use the web viewer and its functions. So ideally, we would like to provide this to the end users.
We stopped providing the end user documentation some years ago due to the nature of our customizable UIs. The WebViewer UI itself has many customization options and actually stays independent from WebViewer core (some users choose to build their own UI entirely). It was very hard for us to provide a consistent end-user documentation that works for everyone.
On the other hand, if you are interested in writing your own documentation, a good place to take some references from would be our showcase page.