I created a custom attribute a while ago, and I see that it has disappeared from the listing in File Manager - Attributes. However, it still shows up as one of my Custom attributes on my pages.

On the flip side, on another site, I want to add that custom attribute. However, after I add it, it shows up in the File Manager-Attributes section but does NOT allow me to add the attribute to the pages.

Any help? I'm running 5.4.1.1

Thanks.