Auto-rename when adding an attachment

Sometimes zotero doesn't recognize the pdf file attached in the website (or the website doesn't support zotero well. For example: http://www3.interscience.wiley.com/journal/119025903/abstract?CRETRY=1&SRETRY=0). So I have to add the attachment manually. For other reasons I need a good file name (say, for search in windows). When the pdf files are recognized and downloaded by zotero, it does a good job to rename the file to authors - title. Can such renaming process be done when I manually add a pdf to an item that exists in the zotero library?

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