Recently I tried to update some content in the Magento Page Builder but it keep spinning.
On checking the developer tool, it shows
from origin 'null' has been blocked by CORS policy: No 'Access-Control
To fix this, I have added the following configuration in my apache .htaccess
Header always set Access-Control-Allow-Origin "*"
Header always set Access-Control-Allow-Methods "GET, POST, OPTIONS, DELETE, PUT"
Header always set Access-Control-Allow-Headers "Content-Type, Authorization"