Figma Library Adding Issue

First I created a new Figma design file A in the team XYZ then, I was able to see my organization library PQR, I added , then with some reason I removed , but again when I want to add it again , but the same library not appearing at all. But in the same team XYZ, I created another design file B, again I am able to see the same library PQR, what could be the reason.