编辑器右侧面板的背景上传地址在哪配置

#### 实现场景：
请简单描述你想要实现的原始场景，例如：我想要实现xxx的功能...
在一些组件的背景配置面板，选择图片上传，找不到路径在哪配置

No file or test is named. Start by locating the editor's right-side background configuration panel and tracing the image-upload entry point; then check the existing configuration documentation or settings for the upload path. Done means the configuration location and required setting are clearly documented.

Written by the indexing model from the issue text.