Camera mounted on a Rig Rail doesn't save keyframed rotations

Hi!

You need to attach camera to RailCameraMount.

Try this way:

                        1. Place camera rig.
                        2. Place camera actor.
                        3. Attach camera to camera rig.
                        4. Align camera to RailCameraMount.
                        5. In Sequenser add Camera Rig.
                        6. Camera Rig -> + -> Track -> Current Position on Rail.
                        7. Camera Rig -> + -> Track -> RailCameraMount.
                        8. RailCameraMount -> + > Track -> Transform.

Useful links:

Also you can download "Sequencer" project: