1. Select Remote Videos
2. Select Category
3. Paste your youtube link/url
4. Select Status - Published/Unpublished
"This will do all the work for you and add the thumbnail for your video."
Pro Tip: Download the Xbox app on your phone and sign into your xbox live account through the app. Then select your video within the app and share the link to your youtube channel so it can provide you with a remote link/url to share here.