Mamma Mia 3 keeps getting more and more hopeful updates, and if it truly happens, I really need it to bring back one character who got too little screen time in the second movie. Successful musicals usually get the movie treatment at some point, though not all of them succeed on the big screen as they did on stage. Among the ones that have found great success on the stage and in film is Mamma Mia!, which got a film adaptation in 2008 directed by Phyllida Lloyd. Mamma Mia! was a box office success, granting it a sequel 10 years later.

https://screenrant.com/mamma-mia-3-return-ruby-sheridan-cher-return-reason/