docs(file-transfer): refine drag-and-drop upload section for clarity and consistency across languages

docs-site/docs/guide/file-transfer.md

@@ -62,9 +62,9 @@ Dragonfly 的远程文件能力建立在 SSH 会话之上。也就是说，**文
 - 上传目录与上传文件会统一进入传输队列
 - 适合用来同步脚本、配置文件、发布包或整组静态资源
 
-### Windows 外部拖拽上传
+### 外部拖拽上传
 
-在 Windows 上，文件浏览器支持把资源管理器中的**文件或文件夹直接拖到 Dragonfly 文件浏览器区域**进行上传。
+文件浏览器支持把系统文件管理器中的**文件或文件夹直接拖到 Dragonfly 文件浏览器区域**进行上传。
 
 典型流程：
 
@@ -75,7 +75,6 @@ Dragonfly 的远程文件能力建立在 SSH 会话之上。也就是说，**文
 
 需要注意：
 
-- 这是当前的 **Windows 平台特性**
 - 只有拖到文件浏览器列表区域才会触发上传
 - 某些拖拽来源如果没有暴露本机真实路径，Dragonfly 无法直接解析，这时会提示你改用 **上传文件** 或 **上传文件夹**
 

docs-site/i18n/en/docusaurus-plugin-content-docs/current/guide/file-transfer.md

@@ -40,12 +40,28 @@ The **Open** action is not just a preview. It prepares the round-trip editing fl
 
 ### Upload
 
-Use the toolbar or context menu to upload local files into the current remote directory.
+Use the toolbar, context menu, or drag and drop to upload local content into the current remote directory.
 
 - Multiple files are queued one by one
 - Folder uploads preserve directory structure
 - Good for syncing scripts, config files, or release packages
 
+### External drag-and-drop upload
+
+The file explorer supports dragging **files or folders from your system file manager directly into the Dragonfly file browser** for upload.
+
+Typical flow:
+
+1. Open an SSH session and switch to the file explorer
+2. Drag a local file or folder into the file list area
+3. Release when the drag overlay appears
+4. Dragonfly adds the dropped items to the upload flow automatically
+
+Notes:
+
+- Upload is only triggered when you drop onto the file browser list area
+- Some drag sources do not expose a real local file path. In that case, Dragonfly cannot resolve the dropped item directly and will prompt you to use **Upload File** or **Upload Folder** instead
+
 ### Download
 
 Downloads usually follow one of two workflows: