What's "montage" mean here? I only heard of it as a picture for a criminal.

Native speaker’s answer
Rebecca
A "montage" is a film editing technique in which a series of separate images, moving or still are edited together to create a continuous sequence (video clip). Ex: The ads feature a montage of images - people surfing, playing football and basketball. Ex: On the technical side, the film has slick visuals and an impressive montage at the beginning.