This helped! Now I am trying the acf/update_value.
This is the code I have in my functions file:
///field update
$field_name = "cbr6_review_total";
$value = get_field($cbr6_review_number);
update_field( $field_name, $value );
But it doesn’t update the review total field (the user field) with the number from the review number field (on the post)
