Good evening abthree and all,
The Brazilian embassy answered me in the morning and they stated they don't accept copies, they only legalize original documents attested by the ministry of foreign affairs of UAE.
They didn't mention anything if my friend in Abu Dhabi takes care of the process on our behalf, so it should be fine.
They also didn't say anything about mailing the legalized police clearance certificates to us after paying the fees since they require the original documents to be attested by the ministry of foreign affairs of UAE first, I understand in this case someone needs to be physically present to do it.
The UAE police clearance certificates will be issued online and sent to our e-mails cause we left the country. they will be printed out, attested by the MOFA of UAE then legalized by the Brazilian embassy in Abu Dhabi. I hope they will consider the print-out of the certificates as original documents and not copies, any idea on this?