How to use embedded Viewer App of GroupDocs.VIewer Cloud API in Drupal?
I’m afraid embedded Viewer App is obsolete now and we are not providing its support now. However, you can use GroupDocs.Viewer Cloud API in Drupal via REST Client and transform 50+ file formats to HTML, Image or PDF view. Later you can send the output file to your browser or can view it in your dedicated viewer. You can develop your own viewer or use any third party viewer.