Keyframes and Tweening

While playing around in Toon Boom Harmony Advanced, I was trying to get two of my frames to motion tween. When I looked online for tips, I found one on the keyframe thing where I have my picture, I put keyframes and move an object on that keyframe and it tweens it. I tried to do that but the keyframe wasn’t working. All the keyframes copied the other. Then when I tried using the keyframes, then duplicating the picture, then moving the object, it still wouldn’t tween. Am i doing something wrong?