Adding attachment file to a new item through draging the pdf.file on to the new item doesn't work

Hello,
When I try to add a pdf.file to a new item as attachment, zotero cannot read the data of the pdf.file and name the item. But it worked before. Now I can only drag the pdf.file to the blank space of Zotero and right click to read the metadata, and then it will creat a named item for the pdf.file.
The figures below are my problem, cause I afraid my English is not clear enough to describe it.
https://s3.amazonaws.com/zotero.org/images/forums/u10319259/yomlywivfc4kemw6d8dm.png
https://s3.amazonaws.com/zotero.org/images/forums/u10319259/cwwriayjl5rdxbhmot7x.png
Thanks for helping !
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