检查下载的文件：上传一个适当的文件，其大小和接收格式都在规定的范围内。还要检查大文件和不正确的文件格式。
From Download file check: Upload a proper file within the size limit and accepted format. Also check with large file, improper file format.
检查下载的文件：上传一个适当的文件，其大小和接收格式都在规定的范围内。还要检查大文件和不正确的文件格式。
From Download file check: Upload a proper file within the size limit and accepted format. Also check with large file, improper file format.
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