Adding a logo in a block page designer

I need to add a static logo image to several output documents. The block editor has the instruction:

“Image URL
Try typing { Field Name } to generate URLs using content from your base.”

But nothing I do displays the image.

OK, I finally found a solution - maybe not the best but it works:
First, paste the graphic into a record in a table within your base.
From the grid view copy (Ctrl-C) the graphic.
In the page designer open a static graphic object
Paste the image in the URL field.
What you pasted should look like this:
Image.jpg(http…/.attachments/…/image.jpg)
Delete the parentheses and everything outside of them
What is left is the valid URL for the image, which should now appear on your page.

I created a free googles sites website, uploaded my graphic, and grabbed the image URL to paste in the URL field of the block designer.