Saving iMovie edited clip
How do I save my edited video clip?
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iMovie automatically saves the project as editing is being done on it. The project can then be reopened from the projects browser screen.
To save the project as an edited video clip, share it out (export it) by clicking on the export button (the square with the upward pointing arrow in it) at the top right of your screen. Then choose one of the export options from the box that appears.
— Rich