Maybe the platform you're using doesn't support adding links directly to stories. Check the platform's guidelines or help section.
It might be due to technical glitches as well. Try refreshing the page or restarting the app. If it's a website - based story, clear your browser cache and cookies. Sometimes, security settings on your device or browser can interfere with adding links. For example, if you have a very strict ad - blocker or privacy extension, it could block the functionality to add a link. Check if disabling such extensions temporarily solves the problem.
There could be several reasons for this. First, ensure that you have the necessary permissions. Some platforms restrict link - adding based on your account type or status. Also, make sure the link format is correct. A wrong format might prevent it from being added. If it's a social media story, they often have specific rules about what kind of links can be added, like whether it has to be from a verified source or not.