Hello Baker, Darin C,
Thank you for reaching out to this Q&A Forum.
Currently there is no API available to export a source collection and yes, is it still necessary to add to a reviewset and then export when using Graph API.
Hope fully this API will be available soon, you can provide your valuable feedback in the idea portal;- https://feedbackportal.microsoft.com/feedback/forum/ebe2edae-97d1-ec11-a7b5-0022481f3c80
Hope that helps.
Thanks.
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