Another way to achieve camera switching in Blender is though the VSE or Video Sequence Editor.

1. Establish multiple cameras in the scene.

[![enter image description here][1]][1]

2. Add a scene strip to the VSE for each camera and set the active camera of the strip to each camera in the scene.

If you cannot add a scene strip (because the menu is empty there): you can only add scene strips from others scenes than the current your are in. So just add a new scene and then you can add a scene strip from your original scene.

[![enter image description here][2]][2]

3. Add a Multicam effect strip above these scene strips and use the buttons to switch between cameras. With a VSE preview window open you will see the switching occur (but not in the 3D view)

[![enter image description here][3]][3]

This can be used to feed the compositor with time offset scene renders as well. For example you may want to have a repeated action from alternate angles, simply set up the switching in the VSE then drag the scene strip along the timeline.

[![enter image description here][4]][4]


  [1]: https://i.sstatic.net/34eTG.jpg
  [2]: https://i.sstatic.net/UO9yK.png
  [3]: https://i.sstatic.net/4j7hF.jpg
  [4]: https://i.sstatic.net/DWWVw.png