How to setup collabora online with Nextcloud behind reverse proxy, 3 steps:    -Letsencrypt nginx conf file    -Collabora docker configuration     -Installing collabora app under admin account in nextcloud web page   The key is to use another domain name for the collabora docker and nginx conf file. Meaning, if you have used cloud.* in letsencrypt nextcloud.subdomain.conf, then you gonna have to use office.* in you server directive of the collabora.subdomain.conf.  
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