Hi there,
I have a very similar issue with cPanel. I'm trying to transfer an existing domain to my Squarespace site.
The client has their current wordpress site and email managed through cPanel.
I have tried to follow all the guides online, using Zone Editor but it doesn't allow me to add in my 'www' CNAME record. I also can't see my A records once I enter them in even though it says they've been successfully added.
Any help would be much appreciated!
Thank you!