Requirements
- Cloudflare account with an active domain
- An AzuriomCloud paid plan
If you don't want to use Cloudflare, that's also possible as long as you know what the following means : Add a CNAME record that points to your AzuriomCloud subdomain.
If you don't have a Clouflare account with an active domain, you can follow this link : https://developers.cloudflare.com/dns/zone-setups/full-setup/setup
Now you can "Check CNAME Record" in the AzuriomCloud Setting menu of your admin panel.
No, you can't use a custom extention. Only marketplace extentions are available.
No, you don't have FTP access. You can only manage your website through the Azuriom admin panel.