I've got a channel where the editor is specifying a YouTube link. I'll also need a still from the video, which I can get from YT (see https://stackoverflow.com/questions/2068344/how-to-get-thumbnail-of-youtube-video-link-using-youtube-api); but I want to store the image locally. How would I go about capturing or uploading the file to my upload directory, and having EE perform the resizing service?
Thanks for your help.
Update: I should have specified that I don't want the user to upload the video still. At this point I've got the video ID, and the CMS should fetch the still from YT, and load it into EE's file manager. Any way to do that?