Shouldn;t this trigger be called?

I have defined this function:

CREATE FUNCTION fix_customer_types_case()

and this trigger:

CREATE TRIGGER fix_customer_types_case_trig BEFORE INSERT OR UPDATE ON customer
FOR EACH ROW EXECUTE FUNCTION fix_customer_types_case();

and I put a RAISE NOTICE so I cna tell if the function is called. Yet when I
do a :

\copy to bring data into this table, I do not see the notice.

Shouldn't this fucntion be aclled for that?

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