Why are images not pulling up in popup HTML window even though they work in main HTML window?

I have a Robot Framework test that generates a pop-up HTML report. Right now I’m just testing against a image/video database. Here is a screen grab.

The issue is the images. That link is supposed to navigate to the image. No dice. A thumbnail is supposed to be in that 50×50 square. I can inspect the code, see that the URL is right and even verify the image exists at that location.

When I follow the link, I get this blocked message. No idea why.

I tried it in multiple browsers, so it has to be the way I’m dynamically building the page.

All I’m doing is taking the image file URL from the Robot Framework test results and creating some HTML text in the new window. Later that get’s put into the table in lieu of text or other data. I tried that same approach on the parent window and it works fine.

Why isn’t the image loading in the popup?