To save the menu order use wp_update_post() with each attachment ID and its new menu position:
$thisattachment = array();
$thisattachment['ID'] = $thisid;
$thisattachment['menu_order'] = $new_menu_position;
wp_update_post($thisattachment);
EDIT – assuming these are already attachments and you’re updating them? Otherwise you have to insert the attachments first with wp_insert_attachment
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