> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# File - Go SDK

> File type definition

<Warning>
  The Go SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues).
</Warning>

## Fields

| Field      | Type      | Required             | Description                            |
| ---------- | --------- | -------------------- | -------------------------------------- |
| `FileData` | `*string` | :heavy\_minus\_sign: | File content as base64 data URL or URL |
| `FileID`   | `*string` | :heavy\_minus\_sign: | File ID for previously uploaded files  |
| `Filename` | `*string` | :heavy\_minus\_sign: | Original filename                      |