---
title: "Design Upload Upload"
method: POST
path: "/v1/mcp/design-upload/{session_id}/upload"
tags: ["mcp-iframe-design-upload"]
---

# Design Upload Upload

`POST /v1/mcp/design-upload/{session_id}/upload`

## Request

- Base URL: `https://api.evidenso.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.evidenso.com/v1/mcp/design-upload/{session_id}/upload`
- Auth: none declared

Store one base64 image into the session.

Body is form-encoded (`data=<json>`) to skip the CORS preflight — see the
module docstring and `scope_proposal_api.scope_proposal_submit` for why.

## Path parameters

- `session_id` string, required

## Query parameters

- `sig` string, required: HMAC signature.

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/evidenso/apis/persona-rag-api.md) - [All operations](https://skmtc.dev/evidenso/apis/persona-rag-api/llms.txt) - [OpenAPI document](https://skmtc.dev/evidenso/apis/persona-rag-api/revisions/86408c178d4f?raw)