DBMS_LOB.loadfromfile don't work?

Question

I have a word doc file, I write a stored proc using DBMS_LOB.loadfromfile to load it into a BLOB record.
-the DBMS_LOB.getlength successfully got the length
-but when I use form ole container to show it....the ole container show nothing.
-if I use initialize_container ... it works....why?
my stored proc :-
PROCEDURE XXinsert_file AS
lobd BLOB;
fils BFILE := BFILENAME('UPLOAD', 'A1.TXT');
length integer;
BEGIN
-- update ole_container set ole_content = empty_blob() where container_id = 'CH050100001';
SELECT ole_content INTO lobd FROM ole_container
WHERE container_id = 'CH050100001' for update;
dbms_lob.fileopen(fils, dbms_lob.file_readonly);
length := dbms_lob.getlength(fils);
dbms_lob.loadfromfile(lobd, fils, length);
update ole_container set file_length = length where container_id = 'CH050100001';
dbms_lob.fileclose(fils);
COMMIT;
END XXinsert_file;

Answer 1

Forms wraps files in a larger structure before storing them as blobs. So in Forms you can only read files that were loaded through Forms, and using dbms_lob you can only read files that were loaded through dbms_lob.