nextcloud

The nextcloud template, as all php templates, takes care of the basic php files.

Then, there's only one specific variable that you should take care of:

# ONLY if nextcloud is installed in a subdirectory of an existing vhost,
# where probably DOCROOT above should be the root value of the existing.
NEXTCLOUD_DIR=""

So, set the NEXTCLOUD_DIR variable to the relative url of your server.

Then, once nextcloud is installed, you shouldn't see any warnings or error in the admin page related to nginx. Since nextcloud has many security considerations, you have to be very careful with your php settings. So, you have to review the nextcloud documentation according to the links provided in the admin page for every warning or error.