---
title: "Upload Thumbnail"
method: POST
path: "/projects/{project_id}/thumbnails/upload"
tags: ["thumbnails"]
---

# Upload Thumbnail

`POST /projects/{project_id}/thumbnails/upload`

## Request

- Base URL: `https://api.framesail.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.framesail.com/projects/{project_id}/thumbnails/upload`
- Auth: HTTP bearer

## Path parameters

- `project_id` string, required

## Response `200`

Successful Response

- ThumbnailResponse: Public thumbnail shape — the column allowlist (project_thumbnails is backend-only, like assets).
  - `id` string, required
  - `project_id` string, required
  - `kind` string, required
  - `image_url` string, required
  - `prompt` string, nullable
  - `reference_refs` object[]
  - `model` string, nullable
  - `design` object, nullable
  - `source_thumbnail_id` string, nullable
  - `width` integer, nullable
  - `height` integer, nullable
  - `created_at` string, required
  - `updated_at` string, required

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/framesail/apis/framesail-api.md) · [All operations](https://skmtc.dev/framesail/apis/framesail-api/llms.txt) · [OpenAPI document](https://skmtc.dev/framesail/apis/framesail-api/revisions/12602eae0820?raw)