I have a user that likes to drag-and-drop attachments onto his Inbox of Outlook 2016. This will create a new message with the attachment attached. Recently, he started getting the error message: Cannot copy the items. The operation failed. An object cannot be found. I have tried everything from deleting the .ost file, deleting search folders, creating a new profile, and pressing the Esc key. Nothing has worked. This issue is happening with Word, Excel and .PDF files, just to name a few.