Add motion to layers: presets (fade_in, slide_in_up, pop_in, spring_in, bounce_in, tilt_in, blur_in, wipe_in_right, draw_on, pulse, float, spin, shake, drift, count_up, count_down, orbit, ring_spin, peel and the outs) placed at a start time, raw keyframes per property (with springs), word or letter text reveals (typewriter, scramble), shape morphs between a vector layer's shapes, and stagger to cascade a motion over a layer's children. Motion adds to what a layer has unless replace is set; the timeline grows to fit. Check it with render_contact_sheet. A template with motion can still fill batches as images. Each image shows one moment of the motion. The default moment is the last frame. An outro or a loop can make the last frame a bad image. Find the moment where all the content shows (render_contact_sheet, render_timeline), ask the user if you are not sure, and set that second with set_timeline still_time.