Can anyone please help me?
In the Tatiana theme, you do not see it when you click on the image for the preview item.
It does not work only in Internet Explorer.
In Chrome and Firefox, the preview will be displayed.
URL: www.nadily.eu
Thanks to Filip

IE is not too much considered as browser, developers are tired from looking for alternative solutions for IE...

But in the early days of my preview, it worked, and now it does not work.
On other Tatiana sites, I tried the preview and it works.
The preview image would not even have bothered me, but you can not even see another image from the gallery.
Still, only the "first" additional thumbnails can not be viewed.