So, drag and drop works for me. Google Chrome 76 now supports the drag and drop functionality to our web-app. Everything's great.
Except that it deletes the email I dragged over. This does not happen if I am only dragging the files within the email, only if the email is being dragged over.
Is there any clue as to how to stop the email from being deleted? We're so close to an ideal solution at work and it would be nice to close the lid on this issue once and for all.