Use FileBird with custom post types

Hi; I’m working on a child theme, in which I’ve added a “project” custom post type. I accidentally dismissed a message without really having a chance to read it when I accessed the Media Library for the first time when editing one of said custom posts (with Gutenberg), but I notice I don’t get the FileBird sidebar when managing media for a custom post (works fine with posts and pages).

Is usage with custom posts a Pro feature? Can’t really see that limitation listed anywere, so I don’t know whether I’ve just configured something wrong.