Can't enter on my NAS (NET::ERR_CERT_INVALID)

Hi all.
I’m trying to enter on my NAS admin page: I have NET::ERR_CERT_INVALID error and I know, Server does not have a valid SSL certificate, but I trust it (it’s my NAS).
Brave does not make me able to skip the error, do you have any tips to help me?

macOS 10.15.3 and Brave Version 1.4.96 Chromium: 80.0.3987.132

Tnk in advance

Does the same thing in occur in Chrome?

yes. and also in the new Edge

Can you login via non https instead? I believe all browsers will warn against this for security reasons, allowing someone to whitelist a site (even a local site) could compromise security if you (or the whitelisted site) was inadvertently hacked.

of course, I can login via http only in local, because the external IP works only on https. With Safari and Firefox I can login via https, with Brave (and Chrome and Edge) not, it’s a problem for me.
I can manually sync my bookmarks between my browser at work and at home, but this is a big problem (actually I’m using Brave for everything except Apple developer and the NAS)