Hi @virgodesign
Thanks for the feature request.
I’ll add this to my list, but not sure when it would be added in.
For now, please use some jQuery to modify the text like so:
<?php
add_action('acf/input/admin_footer', 'my_acf_admin_footer');
function my_acf_admin_footer() {
?>
<script type="text/javascript">
(function($) {
$('.acf-field-54ae017167b45 a.add-attachment').text('Build your slider (select up to 4 images)');
})(jQuery);
</script>
<?php
}
?>
