diff --git a/backend/package.json b/backend/package.json
index 6a5dec5..4f44df2 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -31,7 +31,6 @@
     "multer": "^2.0.2",
     "nodemailer": "^6.9.14",
     "@aws-sdk/client-s3": "^3.600.0",
-    "@aws-sdk/lib-storage": "^3.600.0",
     "svg-captcha": "^1.4.0"
   },
   "devDependencies": {
diff --git a/backend/server.js b/backend/server.js
index dffe7ab..2277f03 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -3195,7 +3195,6 @@ app.post('/api/share/create', authMiddleware, (req, res) => {
     });
 
     // 更新分享的存储类型
-    const { db } = require('./database');
     db.prepare('UPDATE shares SET storage_type = ? WHERE id = ?')
       .run(req.user.current_storage_type || 'oss', result.id);
 
diff --git a/backend/storage.js b/backend/storage.js
index 5aa3418..e1fc94a 100644
--- a/backend/storage.js
+++ b/backend/storage.js
@@ -1,9 +1,21 @@
 const { S3Client, PutObjectCommand, GetObjectCommand, DeleteObjectsCommand, ListObjectsV2Command, HeadObjectCommand } = require('@aws-sdk/client-s3');
-const { Upload } = require('@aws-sdk/lib-storage');
 const fs = require('fs');
 const path = require('path');
 const { UserDB } = require('./database');
 
+// ===== 工具函数 =====
+
+/**
+ * 格式化文件大小
+ */
+function formatFileSize(bytes) {
+  if (bytes === 0) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
+}
+
 // ===== 统一存储接口 =====
 
 /**
@@ -309,17 +321,6 @@ class LocalStorageClient {
     // 更新内存中的值
     this.user.local_storage_used = newUsed;
   }
-
-  /**
-   * 格式化文件大小
-   */
-  formatSize(bytes) {
-    if (bytes === 0) return '0 B';
-    const k = 1024;
-    const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
-    const i = Math.floor(Math.log(bytes) / Math.log(k));
-    return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
-  }
 }
 
 // ===== OSS存储客户端 =====
@@ -516,55 +517,34 @@ class OssStorageClient {
   }
 
   /**
-   * 上传文件（支持分片上传）
+   * 上传文件（直接上传，简单高效）
+   * @param {string} localPath - 本地文件路径
+   * @param {string} remotePath - 远程文件路径
    */
   async put(localPath, remotePath) {
-    let fileStream = null;
-
     try {
       const key = this.getObjectKey(remotePath);
       const bucket = this.user.oss_bucket;
       const fileSize = fs.statSync(localPath).size;
 
       // 创建文件读取流
-      fileStream = fs.createReadStream(localPath);
+      const fileStream = fs.createReadStream(localPath);
 
-      // 使用 AWS SDK 的 Upload 类处理分片上传
-      const upload = new Upload({
-        client: this.s3Client,
-        params: {
-          Bucket: bucket,
-          Key: key,
-          Body: fileStream
-        },
-        queueSize: 3, // 并发分片数
-        partSize: 5 * 1024 * 1024 // 5MB 分片
+      // 直接上传（AWS S3 支持最大 5GB 的单文件上传）
+      const command = new PutObjectCommand({
+        Bucket: bucket,
+        Key: key,
+        Body: fileStream
       });
 
-      // 监听上传进度（可选）
-      upload.on('httpUploadProgress', (progress) => {
-        if (progress && progress.loaded && progress.total) {
-          const percent = Math.round((progress.loaded / progress.total) * 100);
-          // 只在较大文件时打印进度（避免日志过多）
-          if (progress.total > 10 * 1024 * 1024 || percent % 20 === 0) {
-            console.log(`[OSS存储] 上传进度: ${percent}% (${key})`);
-          }
-        }
-      });
-
-      await upload.done();
+      await this.s3Client.send(command);
       console.log(`[OSS存储] 上传成功: ${key} (${this.formatSize(fileSize)})`);
 
-      // 上传成功后，手动关闭流
-      if (fileStream && !fileStream.destroyed) {
+      // 关闭流
+      if (!fileStream.destroyed) {
         fileStream.destroy();
       }
     } catch (error) {
-      // 确保流被关闭，防止泄漏
-      if (fileStream && !fileStream.destroyed) {
-        fileStream.destroy();
-      }
-
       console.error(`[OSS存储] 上传失败: ${remotePath}`, error.message);
 
       // 判断错误类型并给出友好的错误信息
@@ -814,21 +794,11 @@ class OssStorageClient {
   async end() {
     this.s3Client = null;
   }
-
-  /**
-   * 格式化文件大小
-   */
-  formatSize(bytes) {
-    if (bytes === 0) return '0 B';
-    const k = 1024;
-    const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
-    const i = Math.floor(Math.log(bytes) / Math.log(k));
-    return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
-  }
 }
 
 module.exports = {
   StorageInterface,
   LocalStorageClient,
-  OssStorageClient
+  OssStorageClient,
+  formatFileSize  // 导出共享的工具函数
 };
diff --git a/frontend/index.html b/frontend/index.html
index 6fe3993..d1740ed 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -606,7 +606,7 @@
             <i class="fas fa-cloud-arrow-up"></i>
           </div>
           <h3 class="feature-title">极速上传</h3>
-          <p class="feature-desc">拖拽上传，实时进度，支持大文件断点续传</p>
+          <p class="feature-desc">拖拽上传，实时进度，支持大文件直连上传</p>
         </div>
         <div class="feature-card">
           <div class="feature-icon">
diff --git a/frontend/verify.html b/frontend/verify.html
index b2e7291..16b0f8b 100644
--- a/frontend/verify.html
+++ b/frontend/verify.html
@@ -221,17 +221,28 @@
       return url.searchParams.get(name);
     }
 
+    // HTML 转义函数（防御 XSS）
+    function escapeHtml(text) {
+      const div = document.createElement('div');
+      div.textContent = text;
+      return div.innerHTML;
+    }
+
     // 显示结果
     function showResult(success, message, showButton = true) {
       const content = document.getElementById('content');
       const iconClass = success ? 'success' : 'error';
       const iconName = success ? 'fa-check-circle' : 'fa-times-circle';
 
+      // 转义用户消息（但允许安全的 HTML 标签如 <br>）
+      const safeMessage = message.replace(/</g, '&lt;').replace(/>/g, '&gt;')
+        .replace(/&lt;br&gt;/g, '<br>');  // 允许 <br> 标签
+
       let html = `
         <div class="status-icon ${iconClass}">
           <i class="fas ${iconName}"></i>
         </div>
-        <p class="message">${message}</p>
+        <p class="message">${safeMessage}</p>
       `;
 
       if (showButton) {