YouTube Studio doesn't count them.
YouTube Studio reports clicks on cards and end screens. It doesn't report clicks on the links in your description or pinned comment, which are usually the links that send people to your offer.
Shorts are stricter. Since 2023, links in Shorts descriptions and comments aren't clickable at all (YouTube Help). A Short can send viewers to one of your long videos with a related video link, and that video's description carries the link.
1. UTM tags and Google Analytics.
Add UTM tags to each video's link, and Google Analytics counts the visits under that video's campaign name. How to add UTM tags to your YouTube links covers the setup.
What it takes:
- Building and pasting a tagged link for every video by hand.
- Keeping the list of which campaign name is which video, because Google Analytics shows the names, not the videos.
- Google Analytics on every page those links open.
2. A link shortener.
Replace each video's link with its own short link. The shortener counts every click before it sends the viewer on.
What it misses:
- The count stops at the click. A shortener can't see what happens on your site, so it can't tell you which videos sell.
- Viewers see the shortener's address instead of yours.
Clicks are half the answer.
The video with the most clicks isn't always the one that sells. How to see which YouTube videos sell your course covers tracking past the click.