Hi Thomas,
Welcome to the online MongoDB Developer Community Forums!
In order to get a better understanding of your question, I have two questions in return:
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What kind of queries will you run on this data after loading? And how do these queries depend on (the type of) this UUID field?
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Why do you prefer to store this field as a UUID “type”? Or now with MongoDB as binary? What influence does it have on the way you can work with the data?
One question I saw on the forum that might be relevant for you is Problem inserting UUID field with binary subType via Atlas web UI
Regards,
Emil Zegers