> For the complete documentation index, see [llms.txt](https://docs.stacksync.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stacksync.com/connectors/airtable/attachments-fields.md).

# Attachments fields

Attachment fields in Airtable expose only temporary links that expire after a certain period. To ensure persistent access to attachments, we transform them into API proxy links when syncing attachment fields.

#### Transformed Link Format

Attachment URLs are converted to this format:

```
https://eu.api-proxy-dev.stacksync.com/v1/airtable_attachment?dt=eyJiYXNlX2lXUGdEIiwgInBhdGgiOiAiIn0=
```

#### How to Use Attachment Links

1. [**Set up an API Proxy**](https://github.com/stacksyncdata/documentation-gitbooks-connectors/blob/prod/api-proxy/airtable.md) - You'll receive an API key upon creation
2. **Make the request** - Include your API key in the Authorization header:

```bash
   curl -X GET "https://eu.api-proxy-dev.stacksync.com/v1/airtable_attachment?dt=eyJiYXNlX2lXUGdEIiwgInBhdGgiOiAiIn0=" \
   -H "Authorization: Bearer <your_api_key>"
```

3. **Automatic redirect** - The API proxy will:
   * Fetch the current attachment URL from Airtable
   * Redirect you to the updated link automatically

This ensures your attachment links remain valid without manual updates.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.stacksync.com/connectors/airtable/attachments-fields.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.