WebViewToolsExtension to open google document viewer in pop up

We have embed a google site inside Thunkable WebViewer. The google site has a list of documents in a list view. While each document inside the list view is linked with a google drive via the shareable link. While clicking on the link, the google document viewer with download option should open in new tab. Since, we are using webViewTools extension for it, the google document viewer is not opening inside the dialog box. Attached here is the screenshot of whats happening currently.

Not Working Screnshot

In the same site, we have a list of links to other pages, which is expected to open the same as above, but its working… The working one, screenshot is attached below
working for google sites

We could’nt understand the reason, its not working for google document viewer, which is supposed to be showing in the pop up.

Please help us, on the possibility of the issue. Since, we have signed a NDA with client, we could’nt share the project also. So please guide us on the right path.