Why can’t I select an image to be used in a newsletter?

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I am trying to insert an image into a newsletter which has been used already in other articles on the page. But the image chooser does not allow me to pick the image. The image is grayed out and its border is dashed. What am I doing wrong?

Screenshot

• This topic was modified 24 minutes ago by  Henrik Sachse. Reason: Corrected the screenshot link
• This topic was modified 24 minutes ago by  Henrik Sachse.