Hi,
We sincerely apologize for the inconvenience.
A 413 Request Entity Too Large error is typically caused by a server configuration limit rather than SP Page Builder itself. Even if you've already increased the PHP upload limits, there may still be restrictions configured on your web server (Apache, Nginx, LiteSpeed, or your hosting environment).
Please follow the troubleshooting guide in the documentation below, which explains the required server configuration changes to resolve this issue:
https://www.joomshaper.com/documentation/sp-page-builder/troubleshooting#:~:text=COM_SPPAGEBUILDER_EDITOR_SETTINGS_PANEL_TITLE_EASYSTORE-,413%20Request%20Entity%20Too%20Large,-If%20you%20noticed
Thank you.