Hhhmmm, according to the specification %U means list of URL whereas %F means list of files. I guess Okular can download URL using KIO and then open the files locally, but qpdfview does not support anything but local files. So maybe Nautilus works correctly for %U but has a bug for %F?
You could try replacing %F by %U and see if that works but I don't think so. I also do not think that I can resolve this and it really might be a bug in Nautilus?
Hhhmmm, according to the specification %U means list of URL whereas %F means list of files. I guess Okular can download URL using KIO and then open the files locally, but qpdfview does not support anything but local files. So maybe Nautilus works correctly for %U but has a bug for %F?
You could try replacing %F by %U and see if that works but I don't think so. I also do not think that I can resolve this and it really might be a bug in Nautilus?