Mom did several things over the span of her career with Disney.
With hand drawn cartoons they recorded the voice soundtracks first before the animation. Timing was critical mom handled that.
Disney also did instructional animation and my mom was a technical writer. How to install and operate the Norton bombsite among others. Mom had to visit WW2 airfields to work with crews to make sure the facts and instructions were spot on.
Then Disney later distributed their own work she wore that hat among others too.
Unions put a stop to wearing many hats for some at the studios.
Walt Disney used to threaten his artists with “someday they’ll have a machine to replace all of you.”
That day has come but it takes 1000 more people to operate those machines.
True fact. Used to take about 1500 to 2000 people to produce a good film. Now with CG (computer generated) scenes and animation it’s 3000 to 3500 people.
Love to hear all this - my background is in film production (but teaching it, mainly). I also worked as a film editor (before digital).