Can't swtich between multiple cameras

Hi everyone,
I needed to work on this file for svg freestyle renders but when i opened it, isaw 8 different cameras and when i tried to switch from one to the other, nothing changed.
What does this mean?
Thank you

First you have to turn an active object into a camera (also a camera)> Ctrl + Numpad 0 (for blender it doesn’t matter what the object is). With Numpad 0 you look through the camera. Tip: Ctrl + alt + Numpad 0 = active view to active camera