LetterHead -- how notes show the Image?

I would customize my letterhead in a client Notes…

I would set a control in my location for show an Image or Other…

I don’t understand How notes…render the Image that I select in Listbox field “DefaultLogo”…

How Notes render the Image that has store in Image Resource?

Tnx to all

I’ve read this link …but this isn’t a solution for understand…