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A practical guide · Two screens

Use one image on both Duo screens

Understand the Same as large source link, restore it after a cover replacement, and check the crop on both Duo displays.

Closed Night Sky iPhone Duo with purple cover artwork against a mint gradient
The Duo cover can reuse the large-screen source.

A linked source is useful for an early composition or a simple branded screen. In the web editor, the small outer screen inherits the large inner source until you give it its own image.

Try it in SynthMock

Start with a Duo scene.

Use a reusable template as your starting point, then apply the choices in this article.

A paid plan is required to use templates and export.

Restore the shared source

An existing template may contain a separate cover image. To return to one source, remove that override using the small card’s clear control. Its accessible label is Use large screen image on small screen.

  1. Select the intended shot and upload the master artwork to Large inner screen.
  2. Inspect the small card. If it already says Same as large, it is linked.
  3. If an independent cover is present, use its clear control to return to the large source.
  4. Set Fold to 0° and inspect the cover crop, then set Fold to 180° and inspect the inner display.
  5. Replace the large source once more only if needed; confirm the linked cover follows it.

Know when to split the sources again

If important text falls outside the cover crop, prepare a separate portrait composition rather than squeezing the wide design until it is unreadable. Uploading a new image to Small outer screen breaks the link for that source and gives you two independent designs.

Do not clear Large inner screen when your goal is only to remove the cover override. The small card previews inherited media, so seeing an image there does not prove it has an independent file. Use the Same as large label and a closed-pose preview as your checks.

Final pass

Before you call it finished

  • The small card visibly reports Same as large.
  • The shared content remains recognizable in both crops.
  • A separate cover is used whenever the shared crop hides essential UI.

Make the next version yours.

Explore Duo templates