Certified copy of the translation --> the document that they give you with the stamps and/or seals.I heard someone sent the copy as well, and they just got their PR. Not sure if they sent a certified copy or just a simple one.
Talking about another kind of document, not the translation one, because I already explained about it.
For example, for Mexico, for birth certificate or any other official document:
Mexico – Instruction(s) for documents
- Official documents issued by this country must be government-certified true copies (copies certified as authentic by the issuing governmental authority, signed and sealed).