> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.coperniq.io/api-reference/forms/attach-file-to-form-field-from-url/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.coperniq.io/_mcp/server.

# Attach file to form field from URL

POST https://api.coperniq.io/v1/forms/{form_id}/fields/file-from-url
Content-Type: application/json

Uploads a file from a public URL into Coperniq and attaches it to a specific FILE-type field on the form.


Reference: https://docs.coperniq.io/api-reference/forms/attach-file-to-form-field-from-url

## Authentication

- `x-api-key` header (required) — API Key authentication via header

## Request

### Path parameters

- `form_id` (integer, required) — Form identifier

### Body (application/json)

This endpoint expects an object.

- `columnId` (integer, required) — ID of the FILE-type field to attach the uploaded file to.
- `url` (string, required) — Public URL of the file to upload.
- `name` (string, optional) — Optional display name for the uploaded file.
- `projectId` (integer, optional) — Optional project ID to associate with the file. This will add the file to the project's 'Docs' section at the root level.
- `action` (enum, optional) — Whether to append to existing files (add) or replace them entirely (replace). Defaults to add.
  - Allowed values: `add`, `replace`

## Response

### 200

File uploaded and attached successfully

- `success` (boolean, optional)
- `fileId` (integer, optional)
- `formId` (integer, optional)
- `columnId` (integer, optional)
- `projectId` (integer, optional, nullable)
- `action` (string, optional)

## Errors

### 400 Bad Request Error

Invalid request

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `NOT_FOUND`
- `field` (string, optional) — Field that caused the validation error (if applicable)

### 401 Unauthorized Error

Authentication failed

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `NOT_FOUND`

### 404 Not Found Error

Resource not found

- `message` (string, optional)
- `code` (enum, optional)
  - Allowed values: `NOT_FOUND`

## Examples

**Request**

```json
{
  "columnId": 1,
  "url": "string"
}
```

**Response**

```json
{
  "success": true,
  "fileId": 1,
  "formId": 1,
  "columnId": 1,
  "projectId": 1,
  "action": "string"
}
```

**SDK Code**

```python
import requests

url = "https://api.coperniq.io/v1/forms/1/fields/file-from-url"

payload = {
    "columnId": 1,
    "url": "string"
}
headers = {
    "x-api-key": "<apiKey>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.coperniq.io/v1/forms/1/fields/file-from-url';
const options = {
  method: 'POST',
  headers: {'x-api-key': '<apiKey>', 'Content-Type': 'application/json'},
  body: '{"columnId":1,"url":"string"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.coperniq.io/v1/forms/1/fields/file-from-url"

	payload := strings.NewReader("{\n  \"columnId\": 1,\n  \"url\": \"string\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<apiKey>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.coperniq.io/v1/forms/1/fields/file-from-url")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"columnId\": 1,\n  \"url\": \"string\"\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.coperniq.io/v1/forms/1/fields/file-from-url")
  .header("x-api-key", "<apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"columnId\": 1,\n  \"url\": \"string\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.coperniq.io/v1/forms/1/fields/file-from-url', [
  'body' => '{
  "columnId": 1,
  "url": "string"
}',
  'headers' => [
    'Content-Type' => 'application/json',
    'x-api-key' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.coperniq.io/v1/forms/1/fields/file-from-url");
var request = new RestRequest(Method.POST);
request.AddHeader("x-api-key", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"columnId\": 1,\n  \"url\": \"string\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "x-api-key": "<apiKey>",
  "Content-Type": "application/json"
]
let parameters = [
  "columnId": 1,
  "url": "string"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.coperniq.io/v1/forms/1/fields/file-from-url")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```

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