I see that {Placeholders} are for file names when saving, and this is a great feature.
But I'd like to use a placeholder (or shortcode) so that Instead of the word "Invoice" for the Header of the pdf invoice, I want it to say: "Invoice 123" (the shortcode will put in whatever number is that current invoice's number.)
Is there a shortcode of some sort that I can use to do that?
MacBook Air
MacOS 26.5.2 (25F84)
SubTotal 1.8.1
PDF Layout 4