Yet, the video quality gets severely lost. If your video is 60 seconds or less and has a square or vertical aspect ratio, it will be uploaded as a Short. Select an existing video from your gallery. This is how you can upload videos from iPhone to YouTube using email. You can directly upload video footage from iPhone to YouTube app. Use the YouTube iPhone and iPad app to upload videos by recording a new video or selecting an existing one: Tap Create Upload a video.Add the video to be uploaded as an attachment.Paste the email address in the "To:" field.