Yasmin Webdav and Nextcloud support doesn’t work on ios. You just get a login loop when setting up a nextcloud location, along with a certificate not valid error, or with webdav connection it just fails. In both cases this is true even after you accept the risk and continue.
All other apps on ips configured against the same webdav or nextcloud source function with no errors or issues. It is only NC that breaks.
I have emailed support and the only thing they ever say is: You set up your server wrong, but never provide details on how to set up a server that BC will function against.
You should just pull nextcloud and webdav out of the locations list on ios. It doesn’t work.