I've had an odd experience on Medium, but I'm not sure if it's a bug or a feature.
When my browser window is narrow (small width), the "add to publication" link is unavailable in the menu. Only when I resize it to a wider width then it's shown, images are shown below.
If this is a bug, let me know how to notify their development team.
Narrow:
Wide:
Top comments (2)
Good observation! I see that they use a media query to purposefully hide it.
good find!