Save URL in URL field when dragging PDF from web into library
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But a couple things might help:
1) There could be a way of setting the parent item's URL field via the attachment, perhaps via the context menu.
2) The parent item's View button could be improved, with the ability to designate a primary attachment. As I note on the ticket, that could help if you have a stable URI in the parent item but the snapshot is from another website that has full text (but that shouldn't be entered as the canonical source).