When running Pagestead on a local server (using software like LAMP, MAMP or XAMP), page and template thumbnails can not be generated. Instead you will see a placeholder image with a message reading “COULDN’T GENERATE PREVIEW – INVALID URL PLEASE TRY AGAIN”.
Unfortunately, it’s not possible to generate thumbnails when running Pagestead locally. When installed on a live server, the thumbnails should generate normally. If you’re seeing this issue on a live server, please contact support.