How to preview a site in plesk, well its very simply once you know how.
https://YOUR_IP_ADDRESS_HERE:8443/sitepreview/http/SITE_YOU_WANT_TO_VIEW/
Newer versions of plesk have this feature enabled on your sites control panel, you will see an icon called “Site Preview”. However; this is not on older versions. So for example you want to view a site called helloworld.com.
You would do:
https://YOUR_IP_ADDRESS_HERE:8443/sitepreview/http/helloworld.com/
Hope this helps someone lol