There is a link box below that you can add a link to a publicly published photo. Like if you have it on your google drive or on facebook. If instead you would rather email it shoot an email to
kiteflyingpres@gmail.com with the subject: "WFGKC Submission" and include which challenge it is for. Alternatively I do have a public dropbox account you can load large photos or video to, simply shoot me an email and I will send you the link!