Meta Box
Support Forum
Support › Meta Box Builder › Metabox Builder Losing Post Type Value When File Advanced Field Added in Group
The issue is described in this video. https://capture.dropbox.com/MFaxrY8wbHsjrc09
Hello,
You can try to follow this tutorial to increase the PHP setting max_input_vars to fix the issue https://metabox.io/wordpress-custom-fields-not-saving-increase-max-input-vars/
max_input_vars
Let me know how it goes.
.
.