Given Film Red being in the sort of canon space that most of the other movies are (the movie itself not being canon, but Uta being a canon character as shown in the manga), here are my Thoughts on Uta and Shanks for this blog’s canon:

When Uta accidentally unleashes the Tot Musica as a child, it ends up being too much of a strain on her and kills her. Without it’s host, the Tot Musica is stopped. However, in a blind rage over her death, Shanks wipes out all of Elegia--killing the civilians and ordering the crew to loot any goods from the wreckage before they depart.

He doesn’t have the heart to tell Luffy that she was killed and he doubles down on not taking kids with him.

Given how protective he was during her childhood, outside of his crew, the only ones who knew about her were Buggy, Mihawk, and Rayleigh. He does not and will not talk about her, though a few remnants of her exist on his ship.