User blog:F8902H/I have a problem about the Gallery on a wiki

I am working on a wiki named Best Techniques In Anime History and I wanted to add a gallery on a certain page but to my surprise, it seems the gallery is not present, it doesn't show at all the gallery symbol to click on it and I am using the Classic Editor.

On the left: this is the wiki where I am working on. I don't know why there is no gallery feature and I really need help to put a gallery but I don't know how to do it.

On the right: On another wiki, the gallery feature is avaible and there is more other features alongside the gallery feature. I don't get it at all why it does show on other wikis but not the one I am working on it.

If someone knows how to do it then please tell me.