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Dear Alex Xing233,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
We've went through your post carefully and understand your concern about not being able to sync SharePoint library as expected. For the issue encountered.
To help you better, please confirm if you are facing the situation similar to the scenario shared in OneDrive sync app error: Unable to sync shortcut - Microsoft Support.
If yes, pleases Remove shortcut to the SharePoint folder in OneDrive and sync SharePoint again to check the outcome.
If this is not consistent with your scenario or any further assistance needed, please feel free to post back and point that. Meanwhile, please share some screenshots of the issue encountered, you operating system version and your OneDrive sync client version with us.
For your reference: Which version of OneDrive am I using? - Microsoft Support
We appreciate your kind patience and understanding that sometime the initial reply may not resolve the concern immediately or there may have some misunderstanding about your scenario, but we would like to hear the updates from your side and let's figure out the further suggestions.
If the understanding above is not consistent with yours, please feel free to post back and point that.
Your understanding and patience will be highly appreciated. We hope that you are keeping safe and well!
Thanks for your cooperation.
Sincerely,
Rhoda | Microsoft Community Moderator