Desc or Asc Order

I was just looking for something similar, they cover this in the docs here:

https://github.com/jchristopher/attachments/blob/master/docs/hooks.md

Basically, it will look like this, but may vary a bit since it depends on your instance name (my_attachments in the example):

function my_attachments_reverse( $attachments ) { return array_reverse( $attachments ); }

add_filter( 'attachments_get_my_attachments', 'my_attachments_reverse' );