1.修改图库的直接下载功能，点击直接保存和下载；

2. 视频预览图限制高度最高200px;

app/Models/SitePreviewVideo.php

@@ -17,6 +17,7 @@ class SitePreviewVideo extends Model
         }
         $result = SitePreviewVideo::where('album_id', $albumId)->get();
         foreach ($voidData as $key => $value) {
+            $voidData[$key]['preview_url'] = '';
             foreach ($result as $item) {
                 if ($item->video_url == $value['video_src']) {
                     $voidData[$key]['preview_url'] = $item->preview_url;