just save and exit … CTRL-X ?
It will handle the location.
Once you have successfully added it to nextcloud (which seems to be using nginx), you can add:
-q --deploy-hook 'service nginx restart'
to the crontab entry line. So that it will restart nginx whenever a cert is actually renewed.
That presumes that the nginx/nextcloud config can “use” the cert right from its’ current location:
/etc/letsencrypt/live/bobscloud.ddns.net/fullchain.pem
/etc/letsencrypt/live/bobscloud.ddns.net/privkey.pem
If not, then you may have to take some additional nextcloud related step(s).