Motion edit prompt

At the start of the animation, collapse the curled cut flap into a flat slit along the paper’s top edge so the sheet appears uncut, while the utility knife rests at the right side with its blade mostly retracted. Make the paper gently bob upward first, then drift back downward. Slide the knife blade out along the knife’s tilted axis toward the upper left by about half the handle’s width, with the thumb slider moving forward in sync. Then translate the whole knife diagonally up-left so the extended blade crosses the paper’s upper edge; during this cutting pass, morph the flat slit into the curled paper flap, opening a short gap in the top outline and bending the cut piece downward and to the right with its attached left edge acting as the hinge. Move the knife back down-right to where it sits in the provided SVG, using ease-out timing, while the new curled flap stays in place. Finally retract the blade back into the handle along the same axis and slide the thumb slider back, ending in the shown pose with the curled cut flap visible.