In order for a Mentor to be able to look over your uploaded Google file, the privacy settings on your Google Doc must be open to the public to view. To make your Google Doc shareable, go to the file in Google docs, click "Share", and change the privacy settings to "Anyone with the link can view."
You can still make changes to it based on feedback and lessons learned once you've facilitated it with your students. Any updates you make will also be seen by the person reviewing your work.
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