Hi!
This is a functionality issue on the part of the new Outlook. Information about this problem is available on the website:
https://techcommunity.microsoft.com/discussions/outlookgeneral/missing-dragndrop-of-attachments-from-new-outlook-to-browsers-sharepoint-%E2%80%93-pleas/4389422
In the case of the new Outlook, whether you add an attachment on a simple page or on a WEBCON BPS form, the result is the same: the attachment is not transferred.
                        
 
             
                                 
                                 
                                 
                                
 
                                