Hello guys,
(REMARK : After some remarks and tests, it seems that it is working only with Synology DDNS (video N°6 & 7) and no-ip.com DDNS (video N°18). Other tests would be needed to better understand. That means that usual method still applies for other options, with redirection of ports TCP 80 or 443 to your NAS).
Here are some more details and i explain how ti install a certificate if you don't know how to apply it.