There are a couple of ways to copy and paste Clips:

1.Use the ctrl tab on your keyboard:

To copy a Clip, just hit Cmd+C (Mac) or Ctrl+C (PC). 

To paste a Clip, just hit Cmd+V (Mac) Ctrl+V (PC)

You can then rename the Clip, if you wish.

2. You can also use the icons in the editor to copy and paste a Clip. You can find these icons above the Stage:

To copy: Click on the Clip you want to copy and the select the copy icon from above the stage (you can see it below the title of your Moov):

To paste: Click the following icon to paste your Clip (you can find it to the right of the copy icon):

To cut: Click the scissors icon to cut your Clip:

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