Docs>Integrations>Advanced Custom Fields
Advanced Custom Fields FAQ
Unable to find ACF field in Custom field list
If the location settings of your ACF field group have been restricted, Import WP can sometimes be unable to find the related field groups, to solve this issue can unrestrict the list of ACF custom fields that the Import WP uses with the fillowing code:
add_filter('iwp_acf/get_fields_filter', function ($args = []) {
return [];
});