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PUT
/
filesystem-multipart
/
{uploadId}
/
part
Upload part
curl --request PUT \
  --url https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'
import requests

url = "https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part"

files = { "file": ("example-file", open("example-file", "rb")) }
headers = {"Authorization": "Bearer <token>"}

response = requests.put(url, files=files, headers=headers)

print(response.text)
const form = new FormData();
form.append('file', '<string>');

const options = {method: 'PUT', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
CURLOPT_URL => "https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: multipart/form-data"
],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
package main

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

func main() {

url := "https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part"

payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")

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

req.Header.Add("Authorization", "Bearer <token>")

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

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

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.put("https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part")
.header("Authorization", "Bearer <token>")
.body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
.asString();
require 'uri'
require 'net/http'

url = URI("https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem-multipart/{uploadId}/part")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--"

response = http.request(request)
puts response.read_body
{
  "etag": "5d41402abc4b2a76b9719d911017c592",
  "partNumber": 1,
  "size": 5242880
}
{
"error": "Error message"
}
{
"error": "Error message"
}
{
"error": "Error message"
}

Authorizations

Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Path Parameters

uploadId
string
required

Upload ID

Query Parameters

partNumber
integer
required

Part number (1-10000)

Body

multipart/form-data
file
file
required

Part data

Response

Part uploaded

etag
string
Example:

"5d41402abc4b2a76b9719d911017c592"

partNumber
integer
Example:

1

size
integer
Example:

5242880

Last modified on June 17, 2026