Fields Do Not Save

Confirm Save was clicked

Field-list changes do not auto-save.

Check the installed version

Confirm the version shown in the plugin interface matches the package you intended to install.

Check the error message

The AJAX save notification can expose the actual server-side failure.

Check logs

• Browser console for JavaScript errors.
• WordPress debug log.
• PHP/server error log.

Large field sets

Checkout Fields sends field configuration as a JSON payload, so large field sets are not expected to fail simply because PHP max_input_vars is low.