> ## Documentation Index
> Fetch the complete documentation index at: https://docs.photon.codes/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Use Stable documentation by default. Honor an explicit Beta request or a URL under /docs/beta/. If the requested version conflicts with the installed CLI package or API origin, clarify the target before writing integration code.
> Pages under /docs/beta/ document Beta; other product pages document Stable. Keep the CLI package, commands, API origin, and credentials within the selected version. State the documentation version in your answer.
> For MCP search, always pass version: Stable or version: Beta. Unfiltered search mixes both versions. For filesystem reads, keep Beta queries under /beta/ and exclude /beta/ from Stable queries; discover paths before reading them.
> The public docs base is https://photon.codes/docs. Convert MCP page paths to public URLs under that base, preserving /beta/ when present. Read https://photon.codes/docs/skill.md for version selection and https://photon.codes/docs/llms.txt for the version indexes.

# getAttachmentSize

```typescript
getAttachmentSize(attachment: Attachment): Promise<number>
```

Get attachment file size in bytes

```ts
import { getAttachmentSize } from '@photon-ai/imessage-kit/helpers'

const size = await getAttachmentSize(attachment)
console.log(`File size: ${(size / 1024 / 1024).toFixed(2)} MB`)
```

## Parameters

<ResponseField name={"attachment"} type={"Attachment"} typeHref={"/reference/stable/imessage-kit/interfaces/Attachment"} required>
  Attachment object
</ResponseField>

## Returns

`Promise<number>`

File size in bytes, or 0 if file doesn't exist


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