For those who don’t remember, Leia briefly wielded the large blaster in the third act of The Last Jedi. Upon waking up from her coma, she and The Resistance prepare for a final stand against Kylo Ren and his forces. When Finn and Rose land on Crait, the Resistance directs their weapons at the ship, thinking it might be from the First Order. That’s when Leia is seen with the futuristic weapon, with Carrie Fisher seemingly posing for a photo in between takes.
Article source: https://www.cinemablend.com/news/2492896/rian-johnson-shares-unseen-photo-of-carrie-fisher-from-the-last-jedi-set