Carrie Fisher, the actress who portrayed Leia Skywalker in the Star Wars films, had quite a few talking scenes in Episode IX: The Rise of Skywalker even though she passed away in 2016.
So how were these scenes filmed? I assume it was a combination of methods: doubles, CGI, old footage, etc. But are there any specifics on how they were able to still have her in the film posthumously? I'm specifically curious if any of the footage was actually her or if it was all special effects.