Now in the galleries and blogpost you have an option to extend the certain gallery or post layout and add a block that relates to this gallery or post only.
Lets say the photoshoot was featured in the magazine and you want to show it in the gallery, or add behind the scenes video like we added to this gallery you are viewing.
Just click “Use custom layout for this gallery” and in Custom Layout tab add a new block. For the current gallery only we added Image Block with embed video code and hid pagination.