an English or French translation
a certified photocopy of the original document
an affidavit from the person who completed the translation (if they’re not a certified translator)
If a certified translator completed your translation:

the document must be stamped with the translator’s certification or registration number
you can indicate that you’re not providing an affidavit because a certified translator completed the translation (write a letter and scan it with your translated document)

我的疑问：
以结婚证为例

1. 中国大陆申请人的中文结婚证，是不是要找公证处出具三份文件：一份English translation, 一份certified photocopy，一份affidavit？
2. “you must also upload": also的意思是原件要扫描上传，也要扫描下面那三份文件，也就是总共要扫描四份文件？
3. 如果原件要扫描上传，还要上传certified photocopy意义何在？还是说这个原来是对纸质申请的要求，没有随着EE的电子申请而做相应的修改？

谢谢解答！