So-- I'm doing hand-drawn frame-by-frame animation. In many cases I need to add a blank keyframe in the middle of a bunch of other finished keyframes. This seems like a very simple task-- but I'm not getting it. If I try to right-click "insert blank keyframe," it just moves the curser over-- nothing is added. If I try to click and drag a new blank keyframe over into the middle of my other keyframes, it PASTES OVER an old finished keyframe, instead of adding a new one. It feels extremely counter-intuitive if you can't move a frame to a new place without pasting over an old frame. There must be a simple way, right?