I use the WordPress plugin "bbpress" to create a bulletin board.

I’m trying to add a file (image) upload function, but I can’t quite achieve it.

I expect to give the URL "example.com/wp-content/uploads/〇〇" at the location where the file is saved, But I can’t .

I would like you to correct my code.Thank you.

  add_action ( 'bbp_theme_before_topic_form_content', 'bbp_extra_fields');
        function bbp_extra_fields() {
        
           $value11 = get_post_meta( bbp_get_topic_id(), 'bbp_extra_field2', true);
           echo '<label for="bbp_extra_field2">pic</label><br>';
           echo "<input type='file' name='bbp_extra_field2'  accept='.jpg,.jpeg,.png,.gif'　 value='".$value11."'>";
        }
        
        add_action ( 'bbp_new_topic', 'bbp_save_extra_fields', 10, 1 );
        add_action ( 'bbp_edit_topic', 'bbp_save_extra_fields', 10, 1 );
        
        function bbp_save_extra_fields($topic_id=0) {
            
            if (isset($_POST) && $_POST['bbp_extra_field2']!='')
            update_post_meta( $topic_id, 'bbp_extra_field2',$_POST['bbp_extra_field2'] );
        }
        
        add_action('bbp_template_before_replies_loop', 'bbp_show_extra_fields');
        function bbp_show_extra_fields() {
          $topic_id = bbp_get_topic_id();
          $value2 = get_post_meta( $topic_id, 'bbp_extra_field2', true);
           echo "pic: ".$value2."<br>";
             echo "picture:".;
           echo'<img src="<?php wp_get_attachment_url( $id ); ?>'.$value2.'.jpg"alt="">';
         }

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