---
title: "Create stream preview upload URL"
method: POST
path: "/streams/{stream_key}/preview/upload-url"
tags: ["Channels"]
---

# Create stream preview upload URL

`POST /streams/{stream_key}/preview/upload-url`

Creates a reusable PUT upload URL for updating the current thumbnail image for the stream.

## Path parameters

- `stream_key` string, required — The stream key

## Request body

- StreamPreviewUploadUrlBodySchema
  - `channel_id` union, required
    - string, snowflake
    - integer
  - `content_type` string — MIME type of the thumbnail image

## Response `200`

Success

- StreamPreviewUploadUrlResponseSchema
  - `upload_url` string, required — URL used to upload the stream preview with a PUT request
  - `method` 'PUT', required — HTTP method to use for the upload URL
  - `content_type` string, required — MIME type that must be sent with the upload request
  - `expires_at` string, date-time, required — ISO timestamp when the upload URL expires
  - `expires_in` integer, required
  - `max_bytes` integer, required

## Other responses

- `400` — Bad Request - The request was malformed or contained invalid data
- `401` — Unauthorized - Authentication is required or the token is invalid
- `403` — Forbidden - You do not have permission to perform this action
- `429` — Too Many Requests - You are being rate limited
- `500` — Internal Server Error - An unexpected error occurred

## Changes

> 19 revisions in range; 1 not diffed.

- **2026-09-18** `dd0ad4ea1c88` — 1 info
  - the `expires_at` response's property pattern was changed from `^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$` to `^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z))$` for the status `200`
- **2026-09-06** `a52a2cf49d9b` — 32 warning
  - added the new `IP_BAN_DECLINED` enum value to the `code` response property for the response status `400`
  - added the new `IP_BAN_DECLINED` enum value to the `code` response property for the response status `401`
  - added the new `IP_BAN_DECLINED` enum value to the `code` response property for the response status `403`
  - added the new `IP_BAN_DECLINED` enum value to the `code` response property for the response status `500`
  - …28 more
  - …this revision’s changelog is incomplete
- …earlier changes not shown

[Full history](https://skmtc.dev/fluxer/apis/fluxer-api/changes/streams/:stream_key/preview/upload-url/post.md)

---

[API](https://skmtc.dev/fluxer/apis/fluxer-api.md) · [All operations](https://skmtc.dev/fluxer/apis/fluxer-api/llms.txt) · [OpenAPI document](https://skmtc.dev/fluxer/apis/fluxer-api/revisions/d15f842dd5f1?raw)