Partial sync after changing webdav location

Hi,
I am syncing my Zotero files with Webdav to a NAS. After changing to a new NAS, it appears that only my new files (added after the change of location) are uploaded to the server. Is there any way to tell Zotero that it needs to reupload all files to the server? Or should I copy my local folder to the server?
Thanks for any comments or help with this!
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