How to insert image manually in oracle apex 18.2 all

Step 1

CREATE TABLE  "MYIMAGES_TBL" 
   ( "ID" NUMBER NOT NULL ENABLE, 
     "IMAGE_NAME" VARCHAR2(400), 
     "FILENAME" VARCHAR2(350), 
     "MIME_TYPE" VARCHAR2(255), 
     "DOC_SIZE" NUMBER, 
     "CHARSET" VARCHAR2(128), 
     "LAST_UPDATE_DATE" DATE, 
     "CONTENT" BLOB, 
CONSTRAINT "MYIMAGES_TBL_PK" PRIMARY KEY ("ID") 
  USING INDEX  ENABLE 
   ) 
/ 
CREATE OR REPLACE EDITIONABLE TRIGGER  "BI_MYIMAGES_TBL" 
  before insert on "MYIMAGES_TBL"               
  for each row   
begin   
  if :NEW."ID" is null then 
    select "MYIMAGES_TBL_SEQ".nextval into :NEW."ID" from sys.dual; 
  end if; 
end; 
/ 
ALTER TRIGGER  "BI_MYIMAGES_TBL" ENABLE 
/

CREATE SEQUENCE MYIMAGES_TBL_SEQ
  MINVALUE 1
  MAXVALUE 999999999999999999999999999
  START WITH 1
  INCREMENT BY 1
  CACHE 20;
 
 
 Step 2
create blank page
& item P13_FILENAME text , 
          P13_MIME_TYPE text,
          P13_CONTENT  file browse


--This page after submit plsql code

 declare 
  doc_size integer; 
  Upload_blob blob; 
begin 
   --Copy BLOB to Upload_blob variable 
   select blob_content 
   into   Upload_blob 
   from   APEX_APPLICATION_TEMP_FILES 
   where  name = :P75_FILE_BROWSER; 
 
   --Get BLOB size 
   doc_size := dbms_lob.getlength(Upload_blob); 
 
--Copy data to table MyIMAGES_TBL 
if doc_size <= 1000000 then 
   insert into MyIMAGES_TBL ( 
          IMAGE_NAME, FILENAME, 
          MIME_TYPE, DOC_SIZE, 
          CONTENT ) 
   select :FILE_NAME, filename, 
          mime_type, doc_size, 
          blob_content 
   from   APEX_APPLICATION_TEMP_FILES 
   where  name = :P75_FILE_BROWSER; 
     
   --Delete temp files   
   delete from APEX_APPLICATION_TEMP_FILES where name = :P75_FILE_BROWSER; 
else 
   delete from APEX_APPLICATION_TEMP_FILES where name = :P75_FILE_BROWSER; 
   commit; 
   raise_application_error(-20001,'Cannot upload pictures bigger than 1MB!'); 
end if; 
exception 
 when others then 
     raise_application_error(-20001,'Error when uploading image!');     
end; 



Step 3

Run