Hi mmenigma,
Thanks for reaching out.
Currently, this preview is only available for ad units with the image ad type.
I want kindly ask you to put the idea for the preview of other ad types on our feature requests list.
Best regards,
Joachim
Hi mmenigma,
I wanted to add that I can think of private or password-protected pages and articles only visible to the admin account for testing the ads.
Another way would be to build your ads with the rich text ad type, Gutenberg or another frontend page builder with shortcodes. Using this method you are able to “preview” the ad as well.
Best regards,
Henning