This is the 2781st most frequent Japanese word.
載せ
"載せ" means "to place, load, or put something on."
Here, '載せ' is used to mean 'publish or post' something, in this case, an article on a platform (blog).
記事をブログに載せました。
I posted an article on the blog.
In this instance, '載せ' refers to physically placing an object onto something else, exemplified by the luggage on the car's roof.
車の屋根に荷物を載せた。
I placed luggage on the roof of the car.
Here, '載せ' means to include or incorporate content, specifically the photos into an album.