Can't paste copied motion onto new tween
I can't figure out why but I can't paste a copied motion onto a new motion. Both layers are motion tweens but after I copy the motion from one and go to paste it on the blank motion tween, it doesn't let me. The paste motion option is greyed out. Neither layers are locked so I'm confused as to what I'm doing wrong. The things on both layers are movieclip symbols as they're meant to be.
Any help would be great, thank you.

