Folder results stores snapshot instead of pdf
Often when I'm looking at an embedded pdf in a Firefox window, the icon is a folder that when clicked gives only one choice. That choice has the title of the paper, but when I select it I get a snapshot, not a pdf. Full disclosure: I've only ever had this happen using SciHub, but it is the usual case for me with that site. The snapshot I get appears to come from the location of the paper from the SciHub metadata.
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If you want to save the PDF directly, you'd have to open it in its own frame. (Generally you can do that by right-clicking on the frame, but I'm not sure if that's an option for a PDF in a frame.)
You can also save from the article page elsewhere and then attach a PDF manually.