I'm having trouble with the Mark Up in Skitch feature. The way I think it should work (maybe this is not the intention) is that I have a note with a PDF and I click to "Mark Up in Skitch" (from toolbar). Then I make any annotations and my original note contains the edited PDF. No duplicates, no extra notes, etc. But every time I annotate, Evernote produces a duplicate note and my annotated PDF appears in the duplicate note and my original note just contains the un-marked up PDF. Am I doing something wrong or is this how this feature is supposed to work?