thanks you, PeterJ.
I change CMS to use Mixed Storage, the problem has been solved:)
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How big is the file that you are uploading? If it is large (> 1/2 MB) you might
have to adjust the max_allowed_packet setting within MySQL.
Also, the console log, or the server/default/log/server.log, usually have
better error messages. The errors displayed in the browser tend to be too
generic
