In Edpuzzle, you can't edit a video that has already been assigned. Instead, you'll need to copy the video and then follow these steps:
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Go to the "Content" tab, then click on "My Content" in the left side menu.
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Check the box below the video you want to copy and select "Duplicate" from the bottom menu.
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Now check the box below the copied video and select "Edit" from the bottom menu.
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Edit the video, then click "Finish."
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Assign it to the class again.
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Go to "Content," select the original video and delete it (unless you want to keep both).
Note: By deleting a previous video, all student data associated with that video will also be deleted for privacy reasons.