F.x. if i can go to my post and upload (x) amount of images -> then i can click on a checkmark to activate the galley in the widget.
The widget will be invissible on any page who didnt activate the function.
When the function is activated the widget will only show the images from the page/post/whatever when you are on the page/post/whatever, and they will change when you move to another page who is activated in the function.
Tell me if you dont understand me then i can try to be more specific. ??