Apex domains cannot have CNAME records.
Question and response
Question
dig cloudsend.com.br. NS
Answer
cloudsend.com.br. 5 NS ns-1726.awsdns-23.co.uk.
cloudsend.com.br. 5 NS ns-467.awsdns-58.com.
cloudsend.com.br. 5 NS ns-1004.awsdns-61.net.
cloudsend.com.br. 5 NS ns-1318.awsdns-36.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0