When using CKEditor to write/edit a document in eXo Platform, you can also:
Click to open the Insert link to a site page form.
Enter the site title of the link in the Title field.
Enter the site URL manually, or you can also clickto open a page containing all the sites in the same server, then select one that you want.
Clickto view the site.
Clickto accept inserting the site to the document.
Click to open a page.
Click the plus before the document name, or click directly the document name in the left pane to show the content in the right pane, or click to upload a file from your local device.
Click content that you want to insert to the document.