## Upload File

`FileCreateResponse Files.Create(FileCreateParamsparameters, CancellationTokencancellationToken = default)`

**post** `/api/v1/beta/files`

Upload a file using multipart/form-data.

Set `purpose` to indicate how the file will be used:
`user_data`, `parse`, `extract`, `classify`, `split`,
`sheet`, or `agent_app`.

Returns the created file metadata including its ID for use
in subsequent parse, extract, or classify operations.

### Parameters

- `FileCreateParams parameters`

  - `required string file`

    Body param: The file to upload

  - `required string purpose`

    Body param: The intended purpose of the file. Valid values: 'user_data', 'parse', 'extract', 'split', 'classify', 'sheet', 'agent_app'. This determines the storage and retention policy for the file.

  - `string? organizationID`

    Query param

  - `string? projectID`

    Query param

  - `string? externalFileID`

    Body param: The ID of the file in the external system

### Returns

- `class FileCreateResponse:`

  An uploaded file.

  - `required string ID`

    Unique file identifier

  - `required string Name`

    File name including extension

  - `required string ProjectID`

    Project this file belongs to

  - `PresignedUrl? DownloadUrl`

    Schema for a presigned URL.

    - `required DateTimeOffset ExpiresAt`

      The time at which the presigned URL expires

    - `required string Url`

      A presigned URL for IO operations against a private file

    - `IReadOnlyDictionary<string, string>? FormFields`

      Form fields for a presigned POST request

  - `DateTimeOffset? ExpiresAt`

    When the file expires and may be automatically removed. Null means no expiration.

  - `string? ExternalFileID`

    Optional ID for correlating with an external system

  - `string? FileType`

    File extension (pdf, docx, png, etc.)

  - `DateTimeOffset? LastModifiedAt`

    When the file was last modified (ISO 8601)

  - `string? Purpose`

    How the file will be used: user_data, parse, extract, classify, split, sheet, or agent_app

### Example

```csharp
FileCreateParams parameters = new()
{
    File = Encoding.UTF8.GetBytes("Example data"),
    Purpose = "purpose",
};

var file = await client.Files.Create(parameters);

Console.WriteLine(file);
```

#### Response

```json
{
  "id": "dfl-aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
  "name": "invoice.pdf",
  "project_id": "123e4567-e89b-12d3-a456-426614174000",
  "download_url": {
    "expires_at": "2019-12-27T18:11:19.117Z",
    "url": "https://example.com",
    "form_fields": {
      "foo": "string"
    }
  },
  "expires_at": "2019-12-27T18:11:19.117Z",
  "external_file_id": "ext-12345",
  "file_type": "pdf",
  "last_modified_at": "2019-12-27T18:11:19.117Z",
  "purpose": "parse"
}
```