Hi @dailyreup
This will show the first image if it exists, otherwise fallback to the secondary image. If none exists nothing will show.
<?php
$header_image = ( get_field('header_banner_image') ? get_field('header_banner_image') : get_field('secondary_header_banner_image') );
if( $header_image) {
?>
<img src="<?php echo $header_image; ?>" alt="" />
<?php } ?>
Is that what you where after?
