https://www.icyphoenix.com/viewtopic.php?f=26&t=6776&p=46664#p46664
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Mighty Gorgon
Wed 23 Dec, 2009 13:51

Re: Filename Cannot Be Empty Error Mesage While Uploading
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It happens because your server has a limit in uploading large files.

Ask your host which is the limit for files upload via HTTP.