Regarding OnlyOffice integration since Nextcloud 18: for your information, you need to configure the (community document) server with https://<myyunohostdomain.tld>/nextcloud/index.php/apps/documentserver_community/ in OnlyOffice settings (thanks https://github.com/YunoHost-Apps/nextcloud_ynh/issues/287#issuecomment-615487504 for the information)
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