Automatic display a category in a gallery

I’m using albums and galleries in my Elementor website.
1/ adding images in my albums how can I add my categories ? It seems that categories can be param only for a gallery and not images in each category.
2/ when succeeding in adding images depending on a category is there a way to create a gallery that will automatically display all website images from chosen category ?
Tye idea is to display in this new gallery all images from an author.

Thx by advance