I am not seeing anything (relevant) in the Nextcloud logs (as viewed from the web app). In iOS I get a message about SSL verification failed, and do I want to try connecting without it. Either way it cannot validate credentials. I know the username and password are correct (tested multiple times/work to login in the browser), and the SSL cert is valid.
Also /var/log/Nextcloud/ is empty. Where else should I look for logs?