Why are you toggling the Animation on and off? You only need to do this once, to turn on keyframe animation. Once it is toggled on, you add additional keyframes via the Add/Remove Keyframe button:Once you have keyframes for the animation, clicking on the Animation toggle will potentially remove any keyframes you have for that parameter - which is why you get the warning.MtD
We understand. Still looking for a way to turn this warning off as it's disruptive when amending long-form with previous animated camera moves! Turning this warning off (like in AE) would save a few hours over a year.