I did some further research.
What is also not working => <a href="images/example.jpg">link text</a>
I would expect that the picture is opened and shown via the html code. But it isn't. Only an empty picture is shown.
What is also interesting: When clicking on a embedded image, the same image viewer is opened and does showing the images within. So why is this not working when opening the image as a link? This would be very convenient. Because sometimes I don't want to embed the images between the text. I just want to have a link and only when clicking on it, the image is shown.
Could you maybe integrate this, please? Would be wonderful.