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Wordpress get_posts (show all attachments) pagination outside of the loop
<?php
$args = array( 'post_type' => 'attachment', 'numberposts' => -1, 'post_status' => null, 'post_parent' => null );
$attachments = get_posts( $args );
if ($attachments) {
    foreach ( $attachments as $post ) {
        setup_postdata($post);
        the_attachment_link($post->ID, true);
        the_excerpt();
    }
}
?>