File field in non-project-entity (eg Pipeline Configuration) not seeing non project files

I’m wanting a field in my pipeline configuration entity to filter by global file entities, so I can select an attachment of another non-project entity.
It looks like the web gui makes the assumption that files always belong to a project. When I start typing, I can get files linked to projects, but not files linked to non-project-entities.
I can see this being by design (in which case it should be configurable) or it might just be a bug.
Is this something that can be fixed?

Is your file field set to be able to link to the entity you want?