Feature Request: Download animations and videos

[CmdrShepardsPie]

Currently when I download a gallery (particularly on Pixiv) it saves the preview/thumbnail of a video/animation (whether it's gif, webm, etc.) but not the whole video/animation. Can you make it so it saves the video/animation, or perhaps both the video/animation and its preview/thumbnail? Not referring to external links (though that would be great as a lot of people link to files on other file sharing sites, some of which are direct downloads) but at least just the video/animation uploaded to Pixiv (or any other supported galleries)