SDK does not support 'file' type messages as indicated by example

[tortis]

The example found here for attaching a PDF does not work.
https://openrouter.ai/docs/guides/overview/multimodal/pdfs#using-pdf-urls

It produced a typescript error:

1. No overload matches this call.
     Overload 3 of 3, '(request: SendChatCompletionRequestRequest, options?: RequestOptions | undefined): Promise<SendChatCompletionRequestResponse>', gave the following error.
       Type '"file"' is not assignable to type '"input_video" | "video_url" | "text" | "image_url" | "input_audio"'. [2769]

If I force past the typescript error, I get an error back from the OpenRouter API:
OpenRouter API error: Input validation failed: ...

Is it possible to send PDF files via the SDK currently?