Thank you for posting in the Community. If your school has the Learning with Google integration then Google drive is not an option for a content block but you can attach a file from Google Drive into a Learning Page by choosing the ''Choose from My Google Drive'' option under ''Add Content Block''. I recommend reviewing this article to get steps.
If you have an Independent Teacher Account user or a teacher at a school that does not currently use Google Integration with Learning, you can get a file from your system by choosing the ''File'' option. I recommend reviewing this article to get the steps.
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