请问签证申请，Immi account上传文档的疑问

签证申请，Immi account上传文档时，官网有如下要求:All supporting documents should be scanned and uploaded withyour application. All documents that you provide must be certified copiesof original documents. Do not include original documents unless specificallyrequested to do so by the department.  要求所有文档要certified copies，不要原件。请问雅思成绩单、职业评估这些本来就是英文的，是否可以直接彩色扫描后上传？还是必须先去公证，然后扫描公证件再上传？
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