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Multiplicity is good too but only issue I found is that it uses keyboard configuration of the secondary pc instead of primary. So if you have another language or another keyboard (dvorak vs qwerty) you need to guess keys in your primary keyboard.
there are right-click context menu tools for various uploader services. if you use screenshot captor to capture images, you should be able to right click on any screenshot and upload from the thumbnail panel in screenshot captor.