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Zone	Effect	Colour	Video, GIF / image or Lottie .json file, or a YouTube / video / GIF link (overrides effect)

× Projection Mapper
Shift+Space edit mode: drag a zone, or its corners, onto a surface
  in edit mode: Shift+drag = fine, Alt+drag = rotate/scale, R rotate 90°, ] / [ bring forward / send back, s solo zone, x switch zone off/on
  or click a zone for its bar: effect, colour, 📎 video / GIF / link, ⟳ rotate 90°, ◐ off/on, ⧉ duplicate, ▲ / ▼ forward / back, ✕ delete
  N new zone, ⌘/Ctrl+C / V copy / paste selected zone, Delete remove selected zone
P panel: effect, colour, video / GIF / Lottie / YouTube per zone, export / import setup
G full-screen alignment grid (R / Shift+R rotate it)   F fullscreen   H hide this help
With the mouse: move it for the buttons in the bottom-right corner, or right-click anywhere.
Everything is remembered in this browser except chosen files (links are remembered).