For Nextcloud
In your Nextcloud account, click your user name in the upper-right corner and choose the Apps option in the menu. In the Nextcloud app store, select the Office & text application category in the list on the left. Find the ONLYOFFICE connector and click the Enable button.
Click your user name in the upper-right corner and choose the Settings option in the menu. Click the ONLYOFFICE item in the left-side menu to open the ONLYOFFICE application settings page.
For ownCloud
In your ownCloud account, click the icon in the upper-left corner and choose the Market option in the menu. In the ownCloud app market, select the Tools application category in the list on the left. Find the ONLYOFFICE connector and click the Install button.
Click your user name in the upper-right corner and choose the Settings option in the menu. Click the Additional item in the Admin section of the left-side menu. The ONLYOFFICE application settings page should open.
Configuring the integration app for both Nextcloud and ownCloud
When the connector is installed, you need to configure it. On the ONLYOFFICE application settings page, specify the address of the machine where the Document Server is installed in the Document Editing Service address field. If you’ve changed the port during the installation, do not forget to specify it, e.g. http://192.168.3.202:81
. Click the Save button to apply the settings.
To find out more details on configuring the integration app you can refer to corresponding articles for Nextcloud and for ownCloud.