The outcome of this is a failed attachment download with an error "Failed - Server problem" in my downloads bar. However if the URL referenced in the above event is "...datacontent/image/rteimages" then the drag and drop to windows works fine and I can open the file with no problem.
I also tried another solution which bypasses the save to the ServiceExport folder, by changing this JS event:
The outcome of this is a "Failed - Blocked" attachment download in my downloads bar.
I have checked the permissions on the server folders / internet settings / browser settings and there is nothing preventing a download. We can download an attachment fine with JS function doAttachmentSingleClick.
Any idea why I get these errors? And why I can drag and drop a URL from "...datacontent/image/rteimages" - but not ServiceExport?
***Moderator Edit-Vidyaranjan: Updated SR details***