Link path (slug)
This is the path after your tracking domain (e.g. …/k3m9xq2a), not the ?utm_… part. Each link needs a unique path so we know which click to attribute. You can’t use the exact same URL on every video without putting something different in the link — the browser only sends the URL to the server, not “which YouTube video you watched.” Same path everywhere would make every click identical.
If you leave slug blank, we default to v- plus the video ID (~13 chars). For a short, tidy path, use Generate — meaning lives in Campaign, not in the slug.
UTM labels
These become utm_source, utm_medium, and utm_campaign on the full tracking URL (they do not change the path above).
Link to paste in YouTubeUse the short URL only — no ?utm_… on the go link. Your Cloudflare Worker loads this link’s destination and UTM settings from the app and adds them when redirecting (set Worker env LINK_RESOLVE_BASE and TRACKING_LINK_RESOLVE_SECRET to match Vercel).