"at sync time" Syncing Problem

I change "as needed" to "at sync time" to download all files.
The sync has finished and some files downloaded but others did not download. When I click to a file I get the error "The attached file could not be found. It may have been moved or deleted outside of Zotero." after cync. But the file is stil on web? How can it happened?
Please solve the most important problem of Zotero Sync.
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