Dont' see how this would work in any version of filemaker as you are pasting text into a container field. If you select a file object or a container field and copy it, (not text) you would be able to paste that object or image into the field. But to insert the file "by reference" you would not paste data anymore than you would drag and drop. you'd use the insert option to insert it and you would not insert text or a file name, but a File path based reference to the file that includes more than just the file name.
I will also note that an interactive option does not exist for container fields in FileMaker 11, so if you are sure that this worked in FileMaker 11, try pasting into a field that is NOT optimized for interactive content.