Why can I no longer adjust an effect after Render and Replace?

Work through the cause

1. Save a version before replacement and record which clips were rendered. Keep the original media and related composition files available.
2. Compare the replacement with the source at a few critical frames, especially logo edges, masks and transparent areas.
3. If the effect needs revision, restore or return to the original editable work, make the change and create a new reviewed replacement.

A concrete case (illustrative)

Illustrative case: a composited price badge was rendered for smoother playback. Later the campaign price changes, but editing the flattened replacement cannot recover the separate live type. The original composition is the correct revision source.

Acceptance and next action

Pass when the delivery looks correct and the original editable dependencies remain recoverable. A faster preview does not justify discarding the project. Replacement, proxy generation and final export are different stages with different review needs.

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Source scope: the linked documentation explains relevant tool behavior or technical context. The merchant scenario, review choices and acceptance condition are CartVisual editorial guidance; citation does not imply endorsement.