i want display PDF file into region , i tried that by call application process using below code but always same file open.( plsql dynamic content region)

```
 DECLARE
 V_URL   VARCHAR2(2500);
 BEGIN
 V_URL :='f?p=&APP_ID.:1:&APP_SESSION.:APPLICATION_PROCESS=display_emp_blob:::FILE_ID:' ||:P6_ID;

 Sys.htp.p('<p align="center">');
 sys.htp.p('<iframe src="'||V_URL||'"width="99%" height="1000">');
 sys.htp.p('</iframe>');
 sys.htp.p('</p>');

END;

```

and the application process code in below 

```
CREATE OR REPLACE PROCEDURE OPEN_FILE (P_ID NUMBER)
IS
 vBlob blob;
 vmimetype varchar2(50);
BEGIN
SELECT ORG_FILES.FILE_CONTENT,MIME_TYPE INTO vBlob, vmimetype
            FROM ORG_FILES
            WHERE ID =P_ID ;

 sys.HTP.init;
 owa_util.mime_header(vmimetype,false);
 htp.p('Content-Length: ' || dbms_lob.getlength(vBlob));
 owa_util.http_header_close;
 wpg_docload.download_file(vBlob);
 apex_application.stop_apex_engine;
   exception
    when no_data_found then
    null;
   END;

```

How i can open different PDF file into region based a value in ITEM (P6\_ID) .