I should’ve mentioned I’m using a tablet. Although there’s a convoluted method involving long-hold and the Photos app, it still only save the low-res thumbnail.
Well, I'm not sure if there's a way of doing that on iOS, but I'm on desktop now anyway, so if anyone else just wants a direct link to the full-size image, here it is:
(edit: although, nope, even opening the direct URL to the image reroutes it to the low-res thumbnail version. I just don't think it's viewable on mobile — never mind!)
