When I place an element on the Canvas, for example a rectangle, an I want to add a a picture or a PDF to this rectangle as an example or a further reference then I only have the option to put the picture right on the canvas (next to the rectangle). But I would like to have the picture in the rectangle like in a folder or sth like that. An alternative would be that I could add a Picture or PDF in to a comment. Then I could add that comment to the rectangle and add the picture or PDF to that comment.

Unfortunately you can only link one file. I work a lot with 