Now I posting a single photo to wall like this:
$response = $facebook->api(\"/$group_id/photos\", \"POST\", array(
\'access_token=\' => $access_to
Actually you can upload a multi story photo(I did it using Graph Api and PHP) but the problem comes if you need scheduled this post.Your post is schedule but also it shows on the page's feed.
P.S. I'm using Graph Api v2.9
PHP Code
$endpoint = "/".$page_id."/photos";
foreach ($multiple_photos as $file_url):
array_push($photos, $fb->request('POST',$endpoint,['url' =>$file_url,'published' => FALSE,]));
endforeach;
$uploaded_photos = $fb->sendBatchRequest($photos, $page_access_token);
foreach ($uploaded_photos as $photo):
array_push($data_post['attached_media'], '{"media_fbid":"'.$photo->getDecodedBody()['id'].'"}');
endforeach;
$data_post['message'] = $linkData['caption'];
$data_post['published'] = FALSE;
$data_post['scheduled_publish_time'] = $scheduled_publish_time;
$response = $fb->sendRequest('POST', "/".$page_id."/feed", $data_post, $page_access_token);
$post_id = $cresponse->getGraphNode()['id'];