Subdomain + Cloudflare Help

[M0HX]

So I just installed Sentora latest ver on my VPS. After few attempts to install it on my cp.mydomain.com
i had problem with the dns (cloudflare) but then i got it to work!

The problem now is when i create a subdomain for a directory.. for example:

files.mydomain.com | Folder on my website is: mydomain.com/files

It doesn't work :c waited few minutes after the status changed from Pending to Live!

I also tried to make a CNAME record in cloudflare with the domain:
myfiles | mydomain.com
but also didn't work!

I am using cloudflare with my domain and i set the name servers in Sentora domain (mydomain.com).

Shouldn't it just a simple method of creating the subdomain and choosing the directory ?

Also should i set the DNS records in Cloudflare or in Sentora domain settings?

Can someone please help me guys! 

Thanks in advance.


EDIT: One more question to end this all.
What should i put in Sentora (DNS Domain) nameservers record field??
cloudflare's (etc.ns.cloudflare.com) name servers? or ns1.mydomain.com ?

please help me guys since im 2 newbie when it comes to DNS thingeis.