Reference images are Veo's answer to a product that has to stay itself. You pass up to three pictures of one subject, each marked as an asset, and describe a scene they do not appear in; Veo tries to keep the subject's look while it builds everything else. The rules are strict. References need an 8-second clip, they work on Veo 3.1 and Veo 3.1 Fast but not on Lite, and Replicate's page for the same model adds that a last frame is ignored when references are present.

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