wp query - How to upload 3 attachments to current post?

I have a form which updates a post but when updating I need to be able to also upload 3 posts:

<div class="form-group">
    <input class="form-control" type="file" tabindex="3" name="custom-upload1" id="custom-upload2" />
    <input class="form-control" type="file" tabindex="3" name="custom-upload2" id="custom-upload2" />
    <input class="form-control" type="file" tabindex="3" name="custom-upload3" id="custom-upload3" />
</div>

The post I am updtaing is a draft which I then make it publish and within the same form I need to be able to also change the title, so within the same template I also have:

<div class="form-group">
    <input id="theTitle" class="form-control" type="hidden" name="inputTitle" value="<?php echo $myTitle; ?>" autocomplete="nope">
</div>
<?php if ($post->post_author == $current_user->ID) {
    toPubblish($post->ID); ?>
    <input type="hidden" value="ok" name="pubblish">
    <?php
        if ( get_post_status ($post->ID) == 'publish' ) {
        } else { ?>
            <input id="upTitle" type="submit" name="newTitle" value="BUONA SERATA" class="btn secondary-btn primary-bg">
    <?php }
} ?>

And then I do

if($_SERVER['REQUEST_METHOD']=="POST") {
    if ('BUONA SERATA' === ($_POST['newTitle'])) {

        $post = array(
            'ID' => $id,
            'post_title' => $_POST['inputTitle']
        );
        wp_update_post($post, true); 

        if ($_FILES['postImage']) {
            foreach ($_FILES as $file => $array) {
                if ($_FILES[$file]['error'] !== UPLOAD_ERR_OK) {
               //Add your error action
                } else {
                    $attach_id = media_handle_upload( $file, $post->ID );
                }
            }   
        }
        if ($attach_id > 0){
          update_post_meta($post,'bgc_event_pimg',$attach_id);
        }

        ob_start(); //this should be first line of your page
        $myurl = get_site_url();
        header('Location: '.$myurl."/profile/");
        ob_end_flush(); //this should be last line of your page
    }
}

And in function I have:

function insert_attachment($file_handler,$post_id,$setthumb='false') {

  // check to make sure its a successful upload
  if ($_FILES[$file_handler]['error'] !== UPLOAD_ERR_OK) __return_false();

  require_once(ABSPATH . "wp-admin" . '/includes/image.php');
  require_once(ABSPATH . "wp-admin" . '/includes/file.php');
  require_once(ABSPATH . "wp-admin" . '/includes/media.php');

  $attach_id = media_handle_upload( $file_handler, $post_id );

  if ($setthumb) update_post_meta($post_id,'_thumbnail_id',$attach_id);
  return $attach_id;
}

But the images are uploading but are not attaching to current posts and I cannot see them if I see the posts