---
title: "Add Audio Track"
method: POST
path: "/v1/content/{content_id}/audio-tracks"
---

# Add Audio Track

`POST /v1/content/{content_id}/audio-tracks`

Attach an alternate audio track (dub, commentary, descriptive audio).

Accepts either a direct ``url`` Mux can fetch, or an uploaded audio
``file`` which is staged in GCS first. The Mux create-asset-track API
ingests it without re-encoding video; the track row starts 'preparing'
and flips to 'ready' via the video.asset.track.ready webhook.

## Path parameters

- `content_id` string, required

## Response `201`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-03** `ce1eb608ea73` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/shortkit/apis/shortkit-api/changes/v1/content/:content_id/audio-tracks/post.md)

---

[API](https://skmtc.dev/shortkit/apis/shortkit-api.md) · [All operations](https://skmtc.dev/shortkit/apis/shortkit-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/shortkit/shortkit-api/revisions/ce1eb608ea73/schema)