Updates a post's slug whenever "Upload" or "Published" are pressed.

functions.php

function update_post_slug( $data, $postarr ) {
    if ( ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
        $data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'] ), $postarr['ID'], $data['post_status'], $data['post_type'], $data['post_parent'] );

    }
    return $data;
}
add_filter( 'wp_insert_post_data', 'update_post_slug', 99, 2 );