# File Watcher

The file Watcher is a thread function that automatically monitors the source file path of the imported plan layer (e.g., PDF, DXF, PNG). If the source file is modified externally, the system detects the change and triggers a re-import of the plan in Exaplan while preserving its scaling and position.

### **Purpose**

This feature streamlines the iterative design process by removing the need for manual reloading. users can update the plan in their preferred CAD software, save the file, and see the changes reflected instantly in the 1:1 floor projection.

### **Configuration**

You can enable the File Watcher in the[ Configuration File](https://docs.exaplan.one/configuration/configuration-file) by setting:

```json
"enableFileWatcher":true
```

After you restart Exaplan and load a file, the watcher symbol should show up as below:

<figure><img src="https://2429307855-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F5asvmaYTBUEQm4EqgG47%2Fuploads%2FSXnjmkceNvCuY7BmsEMO%2FEXPLN_fileWatcher.jpg?alt=media&#x26;token=eeeb380d-483b-4877-a411-1e8488d83958" alt=""><figcaption></figcaption></figure>