Owncloud 9: nginx-cache-purge + Memory Caching

Server
1

Hi,

i just installed owncloud 9 with php7 + nginx + mariadb.
I configured memory caching with apcu. It works.
But i wonder if i had to configure nginx cache purge too.
What would be the interest ?
Maybe i don't understand its goal.
Thanks

2

See:

https://doc.owncloud.org/server/latest/admin_manual/installation/nginx_examples.html#nginx-caching-owncloud-gallery-thumbnails