---
title: "Upload a file"
url: https://docs.gleap.ai/en/reference/conversations-api/s2-s-upload
method: POST
path: "/s2s/uploads"
api: "Conversations API"
tag: "S2S Uploads"
operationId: "S2SUpload"
updatedAt: "2026-11-01T18:40:16.191Z"
language: en
---

# Upload a file

`POST https://api.gleap.io/v3/s2s/uploads`

Multipart upload (field `file`, max 25 MB). Returned URLs are signed and expire — attach them to a message promptly and never persist them. Idempotency-Key is not supported on multipart uploads (re-uploading is safe: every upload mints a fresh URL).

## Authorization

- `Authorization` (header, required): `Bearer <token>`

## Request body (`multipart/form-data`, required)

- `file` (string<binary>, required)

## Example request

```bash
curl --request POST \
  --url https://api.gleap.io/v3/s2s/uploads \
  --header 'Authorization: Bearer <token>' \
  --form 'file=<file>'
```

## Responses

### 201 (`application/json`)

Stored

- `url` (string)
- `name` (string)
- `size` (number)
- `contentType` (string)

```json
{
  "url": "string",
  "name": "string",
  "size": 0,
  "contentType": "string"
}
```

### 401 (`application/problem+json`)

Missing, invalid or revoked service account token.

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```

### 404 (`application/problem+json`)

The addressed resource does not exist in this project.

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```

### 413 (`application/problem+json`)

File exceeds the 25 MB limit.

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```

### 422 (`application/problem+json`)

Idempotency-Key reuse with a different request body.

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```

### 429 (`application/problem+json`)

Rate limit exceeded — honor the Retry-After header.

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```

### default (`application/problem+json`)

Any other error, including validation\_failed (400) and internal\_error (500).

- `type` (string, required)
- `title` (string, required)
- `status` (number, required)
- `code` (string, required)
- `detail` (string)
- `request_id` (string)

```json
{
  "type": "https://docs.gleap.io/s2s/problems/conversation_closed",
  "title": "string",
  "status": 0,
  "code": "conversation_closed",
  "detail": "string",
  "request_id": "req_66c0ffee0000000000000001"
}
```