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a) Misconfiguration of user account or server credentials. See the Uploads > Desktop Upload page or the FTP documentation and FTP Troubleshooting Guide.
b) Uploading files larger than a permitted size.
c) Using an old version of the Third Light Uploader.
d) Not having a valid installation of Java when trying to use the Browser Uploader.
e) Disruptions or misconfiguration issues on the underlying network. If you are copying a file from a network share and see error messages mentioning 'exceptions' 'or 'network write errors', try copying the files to your desktop first before uploading to rule out an issue with the shared drive.
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