# Create Presigned Upload Url

**POST /uploads/presign**

Get a presigned URL for direct upload to S3.

The client should:
1. Call this endpoint to get a presigned URL
2. PUT the file directly to the uploadUrl
3. Use the resourceId in subsequent API calls


## Servers
- http://api.example.com: http://api.example.com ()



## Parameters



### Body: application/json (object)

- **contentType** (string)
  MIME type of the file to upload (image/jpeg or image/png)
- **purpose** (string)
  Purpose of upload - determines TTL and validation.


## Responses
### 200
Successful Response

#### Body: application/json (object)
- **resourceId** (string)
  Unique identifier for the uploaded resource
- **uploadUrl** (string)
  URL to POST the form data to
- **fields** (object)
  Form fields to include in POST request
- **maxSize** (integer)
  Maximum file size in bytes
- **expiresAt** (string(date-time))
  When the presigned URL expires

### 422
Validation Error

#### Body: application/json (object)
- **detail** (array[object])



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