I have installed 'Better Preview' to preview ZOO Blog articles prior to them becoming date activated. (Is it intended for this scenario?)
The Zoo (Blog) articles are Public, and Published, but have not yet reached their 'Start Publishing' date. When I click on the 'Preview' button, I get a 'Page Not Found' error.
That looks more like a templating issue.
The Preview buttons under each editor will push that content as the content to use in the page.
Better Preview is not capable of handling each editor content separately and knowing how Zoo will handle that. It isn't specifically designed for Zoo.
If that makes Better Preview useless for you and you want a refund, let me know.