Dragging a pdf link onto a reference saves it as a snapshot not an attachment

Hi there, think this is a bug - or at least its not the behaviour I'd expect. If I click on a link to a pdf and drag it onto a reference, it downloads the pdf but attaches it as a snapshot instead of a file. This happens from a number of different places (JSTOR, informaworld) so I don't think its site specific.
Regards, Jon.

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