Canvas properties won't show up properly in bases

when I assign a property (or more) to a canva it won’t show up properly in base. i.e. I have a canva file name Canva1, I assign type:canva, then status:doing, then topic:pkm.
when I set up a base filtered for type:canva, Canva1 is there, but status and topic properties are neither visible nor selectable. same if I filter a bese for status:doing, Canva 1 is there but other properties are not.

what? and how you do that? There are no properties associated to a canvas file.