Camera and blueprint questions

I would have some camera questions that i didn’t found explanations :

I create a camera on the level, when launching the game it is the hidden free flythrough camera that works not the new dropped one ?

It seems we can’t create a blueprint from a camera object ?
I tried the bp below but it don’t work, it seems the problem is that the hidden camera is always active.

Can we switch from camera to other cameras during a game ? Like in Resident Evil 2 game ?