# Attachment Adapters
URL: /docs/api-reference/adapters/attachments

Upload and compose file attachment handlers.

Attachment adapters control how files become assistant-ui attachments.

```tsx
import {
  CompositeAttachmentAdapter,
  SimpleImageAttachmentAdapter,
  SimpleTextAttachmentAdapter,
  useLocalRuntime,
} from "@assistant-ui/react";

const attachments = new CompositeAttachmentAdapter([
  new SimpleImageAttachmentAdapter(),
  new SimpleTextAttachmentAdapter(),
]);

const runtime = useLocalRuntime(chatModelAdapter, {
  adapters: { attachments },
});
```

## Common Exports \[#common-exports]

* `AttachmentAdapter` is the interface for custom attachment handling.
* `SimpleImageAttachmentAdapter` converts supported image files.
* `SimpleTextAttachmentAdapter` converts supported text files.
* `CompositeAttachmentAdapter` tries multiple attachment adapters in order.
* `CloudFileAttachmentAdapter` uploads files through Assistant Cloud.

For a custom implementation guide, see [Custom Attachment Adapter](/docs/integrations/attachments/custom-adapter).