I asked em client support because dav sync works fine with calendar, contacts, tasks, but not with notes. They replied that the server did not configure the folder for notes. It would help me a lot if the notes could be syncronised as well.
Murena does support notes. (dav journal). But Nextcloud doesn’t have a easy way of creating them. What you have to do is install DavX5. Link it to murena.io, and use that to create a new calendar that is only ‘notes’ type.
Thank you Baggypants! So I did and sync to eM client works. But in murena I cannot find the new calendar. Where has he gone? No file, no calendar there.