Copying from My Library to Group Library - PDFs dissappear

Hi - can you explain why (sometimes) if I copy a sub-collection from my library to a group library the items all copy but without the PDF attachments? I have plenty of storage space (on the Zotero Server) and also have set my preferences to always attach PDFs when adding items, and download PDFs when synching.

I am using Zotero Standalone, but the same is true when using Zotero Firefox. In some cases, some PDFs copy but not others - as though there's a permissions settings. In this case, the PDFs that are not copying are all from items in a journal that I do have online access to:
http://pus.sagepub.com/content/23/1.toc

Thanks for your ideas.
  • edited January 31, 2014
    If the items already exist without attachments somewhere in the group (including in the trash), the existing items will be used, and the PDFs won't be attached. Delete the existing items from the group and empty the trash. (This will be fixed at some point.)
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