diff --git a/application/admin/controller/general/File.php b/application/admin/controller/general/File.php
index dae13aa..70f7c3e 100644
--- a/application/admin/controller/general/File.php
+++ b/application/admin/controller/general/File.php
@@ -45,10 +45,14 @@ class File extends Backend
                 'order'   => $order
             ], $rows, $page);
 
+            $cosConfig = function_exists('get_addon_config') ? get_addon_config('cos') : [];
+            $cdnUrl    = (!empty($cosConfig['cdnurl'])) ? rtrim($cosConfig['cdnurl'], '/') : '';
+
             if (!empty($result['list'])) {
                 foreach ($result['list'] as &$v) {
                     $v['checked']   = false;
                     $v['showTools'] = false;
+                    $v['fullurl']   = (!empty($cdnUrl) && stripos($v['url'], 'http') !== 0) ? ($cdnUrl . $v['url']) : cdnurl($v['url'], true);
                 }
             }
 
diff --git a/application/admin/view/general/file/index.html b/application/admin/view/general/file/index.html
index 9ed3355..96fc5a2 100644
--- a/application/admin/view/general/file/index.html
+++ b/application/admin/view/general/file/index.html
@@ -300,7 +300,7 @@
                     </div>
                     <div @click="handleSelectFile(index)" v-for="(item, index) of fileList" :key="item.id" class="file-list" @mouseenter="enterFileItem($event, index)" @mouseleave="leaveFileItem($event, index)">
                         <div class="file-img-item">
-                            <img class="file-image" :src="item.mimetype.indexOf('image') >= 0 ? item.url : `/s.php/ajax/icon?suffix=${item.imagetype}`" alt="">
+                            <img class="file-image" :src="item.mimetype.indexOf('image') >= 0 ? (item.fullurl || item.url) : `/s.php/ajax/icon?suffix=${item.imagetype}`" alt="">
                         </div>
                         <div v-if="item.checked || item.showTools" class="tools">
                             <div class="top">
@@ -315,7 +315,7 @@
                                     <img src="/assets/img/check-check.png" alt="">
                                 </div>
                                 {/if}
-                                <div @click.stop="handleOpenFile(item.url)" style="margin: 0 12px;" class="v-icon">
+                                <div @click.stop="handleOpenFile(item.fullurl || item.url)" style="margin: 0 12px;" class="v-icon">
                                     <img src="/assets/img/see-see.png?id=1" alt="">
                                 </div>
                                 <div @click.stop="dell(item.id)" class="v-icon">
diff --git a/application/common/library/Upload.php b/application/common/library/Upload.php
index f9c75d4..c43d39d 100644
--- a/application/common/library/Upload.php
+++ b/application/common/library/Upload.php
@@ -446,10 +446,69 @@ class Upload
         $attachment->data(array_filter($params));
         $attachment->save();
 
+        $this->syncToCos($attachment);
+
         \think\Hook::listen("upload_after", $attachment);
         return $attachment;
     }
 
+    /**
+     * 同步文件到腾讯云COS
+     * @param Attachment $attachment
+     */
+    protected function syncToCos($attachment)
+    {
+        try {
+            $addonInfo = get_addon_info('cos');
+            if (!$addonInfo || empty($addonInfo['state'])) {
+                return;
+            }
+            $cosConfig = get_addon_config('cos');
+            if (empty($cosConfig) || empty($cosConfig['secretId']) || empty($cosConfig['secretKey']) || empty($cosConfig['bucket'])) {
+                return;
+            }
+
+            if (!class_exists('\Qcloud\Cos\Client')) {
+                $cosAddonPath = (defined('ADDON_PATH') ? ADDON_PATH : (ROOT_PATH . 'addons' . DS)) . 'cos' . DIRECTORY_SEPARATOR;
+                \think\Loader::addNamespace('Qcloud\Cos', $cosAddonPath . 'library' . DIRECTORY_SEPARATOR . 'Qcloud' . DIRECTORY_SEPARATOR . 'Cos' . DIRECTORY_SEPARATOR);
+                \think\Loader::addNamespace('GuzzleHttp\Command', $cosAddonPath . 'library' . DIRECTORY_SEPARATOR . 'Guzzle' . DIRECTORY_SEPARATOR . 'command' . DIRECTORY_SEPARATOR . 'src' . DIRECTORY_SEPARATOR);
+                \think\Loader::addNamespace('GuzzleHttp\Command\Guzzle', $cosAddonPath . 'library' . DIRECTORY_SEPARATOR . 'Guzzle' . DIRECTORY_SEPARATOR . 'guzzle-services' . DIRECTORY_SEPARATOR . 'src' . DIRECTORY_SEPARATOR);
+                \think\Loader::addNamespace('GuzzleHttp\UriTemplate', $cosAddonPath . 'library' . DIRECTORY_SEPARATOR . 'Guzzle' . DIRECTORY_SEPARATOR . 'uri-template' . DIRECTORY_SEPARATOR . 'src' . DIRECTORY_SEPARATOR);
+            }
+
+            $realPath = ROOT_PATH . 'public' . str_replace('/', DS, $attachment->url);
+            if (!file_exists($realPath)) {
+                return;
+            }
+
+            $client = new \Qcloud\Cos\Client([
+                'region'      => $cosConfig['region'],
+                'schema'      => 'https',
+                'credentials' => [
+                    'secretId'  => $cosConfig['secretId'],
+                    'secretKey' => $cosConfig['secretKey'],
+                ]
+            ]);
+
+            $key = ltrim($attachment->url, '/');
+            $fileHandle = fopen($realPath, 'rb');
+            $client->upload($cosConfig['bucket'], $key, $fileHandle);
+            if (is_resource($fileHandle)) {
+                fclose($fileHandle);
+            }
+
+            $attachment->storage = 'cos';
+            $attachment->save();
+
+            // 如果设置了不保留本地备份，则删除本地文件
+            if (isset($cosConfig['serverbackup']) && $cosConfig['serverbackup'] == 0) {
+                @unlink($realPath);
+            }
+        } catch (\Exception $e) {
+            \think\Log::write('COS Upload Error: ' . $e->getMessage(), 'error');
+        }
+    }
+
     /**
      * 设置错误信息
      * @param $msg