Add the attachments to the $item for the prepare_body_content_filter hook

- Allows filtering on attachments that are added later to the post content

src/Model/Item.php

@@ -2757,6 +2757,8 @@ class Item
 				$filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
 			}
 
+			$item['attachments'] = $attachments;
+
 			$hook_data = [
 				'item' => $item,
 				'filter_reasons' => $filter_reasons