Hello, In my case I just sent scanned copies of the original documents. You just have to keep on checking your email in case some further information is required of you. Good luck
In my experience, u would need to ask whatever your original school to send ur document to the agency, i don't think it has to be in hard copies. And remember to ask the school to address their official identity. Like names and e-mail address. I think this should be right. I also remember that when i uploaded my documents, they still ask me to have my school send them an e-mail to verify ur identity. I hope this would help.
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