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Hi CarlyShakes,
I go through the post carefully, based on the descriptions, May I know if you want to set up How user sync SharePoint folder and set up Always keep on this devices for other users, so that the folders are download to local automatically. If so, you may set up this for users with commands, please check the links below for more info:
For Windows: Set Files On-Demand states in Windows - OneDrive | Microsoft Docs
For Mac: Set Files On-Demand states on Mac - OneDrive | Microsoft Docs
If there are any misunderstanding, could you please share more details with us?
Regards,
Clark