Restore frames in video layers (Photoshop Extended)
You can discard edits made to frame video layers and blank video layers.
In the Animation palette, select a video layer
and do one of the following:-
To restore a specific frame, move the current-time indicator to the video frame and choose Layer > Video Layers > Restore Frame.
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To restore all the frames in a video layer or blank video layer, choose Layer > Video Layers > Restore All Frames.