Uploads a file using Google Gemini API format.
This is a multipart upload with two parts:
Note: Direct file content download is not supported by Gemini Files API. Use the file.uri field from the response to access uploaded files.
Bearer token authentication. Use your provider API key or Bifrost authentication token.
Virtual keys (prefixed with sk-bf-) can also be passed here.
Multipart upload for Gemini Files API. Send two parts: - "metadata": JSON object {"file": {"displayName": "
Successful response