Code 1: https://wordpress.stackexchange.com/questions/307150/save-attachment-custom-fields-on-front-end?noredirect=1&lq=1
--

$vid_pix = get_post_meta($v_Id, 'vid_pix', false);

if (!empty($vid_pix)) {
foreach ($vid_pix as $vP) {
$Pt = get_post_meta($vP, 'photo_time', true);
$Por = get_post_meta($vP, 'photo_order', true);

echo '<img src="' . wp_get_attachment_thumb_url($vP) . '" alt=""/>';
echo '<input type="hidden" name="photo_order" class="photo_order" value="'.$Por.'" />';
echo '<input type="text" name="photo_time" class="photo_time" value="'.$Pt.'"/>';
}
 }

Code 2: https://wordpress.stackexchange.com/questions/307065/change-order-of-images-attached-to-post?noredirect=1&lq=1
--

 <div id="pic-con">
<?php
    if (!empty($vid_pix)) {
        foreach ($vid_pix as $vP) {
            $filename = basename( get_attached_file( $vP ));
            echo '<div class="photo-upload-box">';
            echo '<img src="' . wp_get_attachment_thumb_url($vP) . '" alt=""/>';
            echo '<input type="hidden" class="pic_value" value="' . $filename . '" />';
            echo '<input type="hidden" name="'.$vP.'" class="orders" />';
            echo '</div>';
        }
    }
?>
</div>