How does the router handle requests if they reference file uploads?

[jerem1e]

Let’s say we have one Gemini model and one OpenAI model. I upload a file to Gemini and then send a request to Gemini, but the request fails. I have a fallback configured to OpenAI, but the file was uploaded only to Gemini, not to OpenAI.
In this case, is the router able to handle the situation automatically, or would I need to upload the file to both sources?