I am using the below code to create a ORDS service which will upload a file to a DBA directory.
Could anyone assist me to make the following work. I am getting an error trying to compile this.

    DECLARE
      l_file      UTL_FILE.FILE_TYPE;
      l_buffer    RAW(32767);
      l_amount    BINARY_INTEGER := 32767;
      l_pos       INTEGER := 1;
      l_blob      BLOB := :body;
--      l_file_name VARCHAR2 (100) := :fileName;
      l_blob_len  INTEGER;
    
      l_reqid     NUMBER;
    
    BEGIN
    
      l_blob_len := DBMS_LOB.getlength(l_blob);
    
      -- Open the destination file.
      l_file := UTL_FILE.fopen('XX_FILE','XX_FILE_NAME.csv','wb', 32767);
    
      -- Read chunks of the BLOB and write them to the file
      -- until complete.
      WHILE l_pos <= l_blob_len LOOP
        DBMS_LOB.read(l_blob, l_amount, l_pos, l_buffer);
        UTL_FILE.put_raw(l_file, l_buffer, TRUE);
        l_pos := l_pos + l_amount;
      END LOOP;
    
      -- Close the file.
      UTL_FILE.fclose(l_file);
    
      HTP.P('File Upload Success');  
    
    EXCEPTION
      WHEN OTHERS THEN
        -- Close the file if something goes wrong.
        IF UTL_FILE.is_open(l_file) THEN
          UTL_FILE.fclose(l_file);
        END IF;
        HTP.P('Error: ' || SQLERRM);
    END;

Error report –
ORA-06550: line 6, column 24:
PLS-00382: expression is of wrong type
ORA-06550: line 0, column 1:
PL/SQL: Compilation unit analysis terminated
06550. 00000 – “line %s, column %s:n%s”
*Cause: Usually a PL/SQL compilation error.
*Action: