Newbie Upoad PDF to blob then Delete File.pdf

Question

I want the user to upload A PDF and import it into A BLOB.
That part is working.
If the user uploads the WRONG PDF, I want them to be able to delete the FILEA.PDF.
They can delete the FILEA.PDF, if they wait 4 or 5 minutes.
Delete the FileA.PDF is the part that is not working, if the user does it in less
than 4 or 5 minutes.
The PDF is about 60K.
Below is the sample code:
=========================
<code>
SELECT mypdf
INTO temp_blob
FROM fcsImpactUpload
where renname= 'FileB.PDF'
FOR update;
IF dbms_lob.fileexists(src_file)=1 THEN
dbms_lob.fileopen(src_file, dbms_lob.file_readonly);
lgh_file := dbms_lob.getlength(src_file);
dbms_lob.loadfromfile(temp_blob, src_file, lgh_file);
UPDATE fcsImpactUpload
SET de_pdf = temp_blob
where renname= 'FileB.PDF';
COMMIT;
END IF;
UTL_FILE.FGETATTR('AIMSORAPDF', 'FileA.PDF', DOESEXIST, FLEN, BSIZE);
IF DOESEXIST THEN
UTL_FILE.FREMOVE('AIMSORAPDF','FileA.PDF');
ELSE
EXIT; -- File does not exist
END IF;
</code>

Answer 1

Forget to say verasion
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
"CORE     10.2.0.4.0     Production"
TNS for 32-bit Windows: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production