Can not insert a image link in Portfolio to protected login page

Hi

I have portfolio which works fine.

I have some text and want to place a image button to go to a protected page (which displays a ‘password login’ page.

In admin I can see that image is there along with the protected page login page but in public view no image nor link. If I place only text link to the same protected page login page it works.

Can you help why the image button with link isn’t showing at all?