zotero not sync to a new webdav

Hi, there:

Several week ago, I set up a webdav server (dav_old) and uploaded my attachments. Now I want to set up another webdav server (new_old), all settings are fine, however, zotero would not sync attachments (these attachments had been synced to dav_old) until new changes happen, and only the new changes will be upload.

How can I sync all the attachment to a new webdav?
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