If you meant to refer to the film, the correct title is Mamma Mia! Here We Go Again — and you could say:
"I’m looking for a video of Mamma Mia! Here We Go Again."
Or if you meant a video clip related to the movie:
"Mamma Mia! 2 video"
Here’s a properly written version of your text:
If you meant to refer to the film, the correct title is Mamma Mia! Here We Go Again — and you could say:
"I’m looking for a video of Mamma Mia! Here We Go Again."
Or if you meant a video clip related to the movie:
"Mamma Mia! 2 video"
Here’s a properly written version of your text: