Specifically, I need this for Issues.  We make lots of Comments and would like the Issue’s modification time to update
Ideally, this would be a Custom Script – ie, on new comment, update document modification.
Would I make the script on Communication or Issue doctype?  Help/thoughts?
             
            
              
              
              
            
           
          
            
            
              This is close … but it cannot be an Email Alert.  Instead, it must be Custom Script that just updates the Document’s time.