# upload.cdnFile

Represent a chunk of a [CDN](/cdn.md) file.

```tl
upload.cdnFile#a99fca4f bytes:bytes = upload.CdnFile;
```

### Parameters

| Name | Type | Description |
| --- | :---: | --- |
| **bytes** | [bytes](/type/bytes.md) | The data |

### Type
[upload.CdnFile](/type/upload.CdnFile.md)

### Related pages

#### [Encrypted CDNs for Speed and Security](/cdn.md)
How client apps download popular public files from secondary CDN data centers.