Sync across device, but could not see attached pdf files

Hi, I used sync across device, and the pdf files always attached by when click through web browser, which seems does not work. Have the error message like "The attached file could not be found at the following path:

/Users/XXX/Zotero/storage/WX472UFA/XXX.pdf

It may have been moved or deleted outside of Zotero, or, if the file was added on another computer, it may not yet have been synced to zotero.org.

Anybody have suggestions, from this link, it seems the file is in Zotero, so does not know how to fix it
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