The FlyBy interface is still in its infancy. I will completed it on a later date. For now let's see what we have.
When you enter the flyBy editor, the actual Flyby is shown as text. You can edit the position by changing them, you can also Cut and Paste block of camera movement.
When creating a new FlyBy, a block with default value will appear as a model. You will need to adjust those position.
Saving the FlyBy does actually save the FlyBy, you don't need to save the mission to save the FlyBy.