Nextcloud offline - certificate issues

Hey , I am trying to install nextcloud server with nginx .
I do not use proxy (nginx is communicating directly with nextcloud via container:9000 upstream)
I redirect all my communication to https. Including the nextcloud web URL.

And I am getting error curl 28 for timeout.

So I have decided to check nextcloud AIO to see if it will be supported there and I got an error that certificates are not found .

Which leads me to the question , does nextcloud supports certificates in other solutions except certbot or let’s encrypt ?
And if so , where do I need to put my certificates in order for nextcloud to reach the server and etc ?

replaced the CA-boundle.crt in the nextcloud container , after some configuration update to support the remote access , i was able to connect the two nextcloud machines.