Configure WebDAV for subfolders

[Riyyi]

Hello, I have setup nginx on my server and use its WebDAV module with Orgzly for a while. But when I enable subfolder sync I get an HTTP error 403. I tried some things to get it working, like disabling directory listing to skip static file serving, but I couldn't get it to work. Logging into my server via WebDAV on MiXplorer allows me to create and browse subfolders fine. Any tips?

server {
	listen 443 ssl; # managed by Certbot
	listen [::]:443 ssl; # managed by Certbot

    root /var/www/dav;
    index index.html index.htm;

    server_name dav.mywebsite.com;

    location / {
        dav_methods PUT DELETE MKCOL COPY MOVE;
        dav_ext_methods PROPFIND OPTIONS;
        dav_access user:rw group:rw all:rw;

        client_max_body_size 0;
        create_full_put_path on;
        client_body_temp_path /tmp/;

		auth_basic           "Authorization Required";
		auth_basic_user_file /etc/nginx/.htpasswd-dav;
    }

	ssl_certificate /etc/letsencrypt/live/mywebsite.com/fullchain.pem; # managed by Certbot
	ssl_certificate_key /etc/letsencrypt/live/mywebsite.com/privkey.pem; # managed by Certbot
	ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
	include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
}

[amberin]

We have seen 403 errors from WebDAV servers in some unexpected scenarios, so there is clearly something happening in this domain that we don't understand. See e.g. (the very aptly numbered) #403.