# Update Device File Alias

Update an existing device file alias.

**Endpoint**: `PUT /api/devices/:id/file-aliases/:aliasId`
**Auth**: Required
**Content-Type**: `application/json`

## Path Parameters

| Parameter | Type | Required | Description |
|-----------|------|-----------|-------------|
| id | string (UUID) | Yes | Device UUID |
| aliasId | string (UUID) | Yes | File alias UUID |

## Request Body

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| file_name | string | No | New file name |
| file_hash | string | No | New file hash |

### Example Request

```json
{
  "file_name": "updated-book.epub",
  "file_hash": "newhash123..."
}
```

## Response (200 OK)

```json
{
  "id": "uuid",
  "device_id": "device-uuid",
  "media_item_id": "book-uuid",
  "file_name": "updated-book.epub",
  "file_hash": "newhash123...",
  "updated_at": "2026-02-08T11:00:00Z"
}
```

## Error Responses

| Code | Description |
|------|-------------|
| 400 | Invalid request data |
| 401 | Invalid or expired token |
| 404 | Device or file alias not found |
