In draw.io I tried to add a couple document/drawing level custom properties (just like the predefined properties %version% %page% %pagecount% etc.) , then be able to use their value in placeholders on all the pages of a multi-page drawing. I am not successful. The property is available only on the page that was showing when I defined the property. If there is a way to do this, it is obscured somewhere. Anybody succeeded with this?