Can not edit Legacy Animation

Hello,

I'm experiencing some weird problems which don't seem to be fixable? To play an animation done with the Unity Animaton tool through a script, it must be marked as "Legacy". If I do that, it's fine and works in-game. But I am not able to edit these animations anymore then. They can't be selected in the Animation tool and they vanished out of the Animator entries.

Is there actually a way to use an animation with a script AND being able to edit it?

By the way, the script and the animations, etc. are attached to a GameObject with the camera as a child object.

Thanks.