The jpegs you dragged in haven't been imported yet.
When you're in that "Import" folder, do you see "Cancel", "Import Selected", and "Import All New Photos" radio buttons in the top right corner (same as you see when you connect your camera)?
When I drag one .png to my Dock icon it winds up in "Last Import", but multiples go to "Import", and after I click on "Import All (or Selected)..." my imports move to "Last Import", from where I'm able to distribute them to various albums.
PS: Time to upgrade your sig to El Cap.
