How to link a YouTube video to a script

On the dashboard, open the script's three-dot menu ("Script options") → "Link YouTube video…", paste the watch, youtu.be, Shorts, or embed link, and click "Link video". Or paste the link in the editor's field under the title ("Add a YouTube link to mark this published…").

Linking marks the script Published, fetches the video's stats (owner analytics like retention take YouTube 24–48 hours after publish), and adds a metric strip to the script's row; click it for the mini dashboard, and use "Customize card metrics…" to choose up to 4 metrics to show. "Edit YouTube link…" / "Remove link" change it later. If your channel isn't connected yet, the menu item sends you to connect first. These items are hidden when Settings → "I publish my videos to YouTube" is off.