Pick your video file from your computer, phone, or other device, and upload it. You won't be able to see the file once you upload it, but you'll get a confirmation when it's done, or an error if it fails.
Once it's uploaded, email bron, and she'll reply to confirm that she got it.
You can upload multiple files if you need to. If you uploaded multiple files, you'll want to let her know which one to use.