How to make ANIM button render from camera of choice

Hello all. I have a blender file that has two cameras. Even if I set the active camera to the correct one, ANIM button renders from the wrong one. Where is the drop down list to select camera of choice?

Make sure you don’t have a key frame on the original camera that is keeping it as active - I just tried with two cameras, animations of two frames each, and using ctrl-numpad 0 I was able to switch the assignment back and forth, and render accordingly.

Yeah, I can make it active - which means that Ctrl-0 and regular render work fine. Just not the animation button. I tried deleting the other camera, which is messed up and warps the render, and now the animation button just opens a new window that is all black.