The attached file could not be found.

I used standalone and there are some libraries that I shared with my collage. And Zotero syncs attachment files in group libraries using Zotero Storage as need. So I use Zotero storage and when I need a file, I click the file and it downloads.
I have a great problem. When I would like to carry some files from one library to another. But I get this error: "The attached file could not be found. It may have been moved or deleted outside of Zotero."
How can I solve this problem?
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