---
title: "Recorder Upload Start"
method: POST
path: "/api/recording-invitations/{invitationId}/upload"
tags: ["Recording participants"]
---

# Recorder Upload Start

`POST /api/recording-invitations/{invitationId}/upload`

## Request

- Base URL: `https://mcp.usertold.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://mcp.usertold.ai/api/recording-invitations/{invitationId}/upload`
- Auth: none declared

Execute the UserTold recorder upload start operation.

## Path parameters

- `invitationId` string, required: invitationId path parameter

## Request body

- object
  - `sizeBytes` integer, required
  - `capture` object, required
    - `durationMs` integer, required
    - `pageUrl` string, uri, required
    - `events` object[], required
      - `step` integer, required
      - `atMs` integer, required
    - `interrupted` boolean

## Response `200`

Success

- object
  - `interviewRef` string, required
  - `upload` object, required
    - `uploadId` string, required
    - `partSizeBytes` number, required
    - `partCount` number, required

## Other responses

- `401`: Not authenticated
- `404`: Not found
- `422`: Domain error (non-retryable)
- `500`: Internal server error
- `503`: Domain error (retryable)

---

[API](https://skmtc.dev/usertold/apis/usertold-ai-api.md) · [All operations](https://skmtc.dev/usertold/apis/usertold-ai-api/llms.txt) · [OpenAPI document](https://skmtc.dev/usertold/apis/usertold-ai-api/revisions/37d5b4f88d38?raw)