For a while now I've noticed that when merging or duplicating notes, some attachments (web clippings, PDFs, etc.) get dropped. Not all of them, but some of them. I just duplicated a note that contained a web clipping, and the note got duplicated but the web clipping was missing. When merging multiple notes some of which may contain attachments, it's a hit or miss; some of the attachments make it to the merged note but others do not. Like I said, this has been going on for a while now and I have reported it several times, but I never got a response. I suppose I need to open a ticket...