Sync Document Libraries between 2 Sites

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With no access to OneDrive, is there a way to sync (prefer automatically) Document Library 1 (with large items and subfolders) from SharePoint Site 1 to Document Library 2 in SharePoint Site 2?

Users can only access SharePoint Site 2, NOT SharePoint Site 1; I am able to access Site 1 as administrator, Site 2 as owner.

I found useful reference: https://sharepoint.stackexchange.com/questions/280532/mirroring-two-sharepoint-libraries/298651#2986...
But, there are some issues with this, 1) as I am not able to autosync the subfolder, the file only appeared in Site 2 in root folder; 2) if I change the file name in Site 1, instead of replace in Site 2, it was copied as another new file in Site 2
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