Thank you all for your response! I also thought of downloading the 1.3.8 version again, but with 1.3.8 even when I updated it to ”FooBox Gallery”, there was a problem: Every time I was choosing to open a photo, I had to close it and then to open the next one again. So I have never really managed to apply FooBox on my website.
@bradvin here is the link to my website: https://elenapatsalidou.com/de/galerie/
