Attach custom gallery to a page

You can upload images in media of each page by using INSER GALLERY button.You can Upload multiple images & galleries also.

You can get all images of each page by using below code.

$images = get_posts(
    array(
         'numberposts' => -1,
         'post_parent' => $post->ID,
         'post_status' => 'inherit',
         'post_type' => 'attachment',
         'post_mime_type' => 'image',
         'order' => 'ASC',
         'orderby' => 'menu_order'
         )
);