In short, you don't. The project file itself is auto-saved, and is of no value to you except for editing.
For consumption, you need to export/publish the video. You can do this under File->Share->File... (or whatever option you prefer under share) or using the Share icon.
That's not much of a different workflow than FCP by the way.
Originally Posted by
sicario666 How do I save my project when using imovie? I've looked at a few YouTube videos and read a few articles searched on Google. I still can't get any solid answers. Anything helps. Thank you.
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