You may get some of it done without HTTPS inspection by looking at the Certificates.
Application & URL Filtering => Advanced => Engine Settings:
Make sure you enable Categorize HTTPS sites if you do NOT enable HTTPS inspection!
And make sure you do NOT use it if you use HTTPS inspection!
But keep in mind that there is no way to distinguish between Google Drive, YouTube or any other Google service as they all use the same certificate. (Rather cheap Google!)
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