Create a Presigned URL

POST

/presigned

Requires authenticated session. No explicit route-level permission check is enforced in this route. Generates a presigned upload URL for an authenticated user. The canned ACL is derived from type and is not accepted from the client: LETTER and SUBMISSION objects are stored private and must be read back through GET /files/{key}, every other type stays public-read behind the CDN. The ACL is signed into uploadUrl, so the PUT must not send an x-amz-acl header.

Request

Authorization

API Key

Add parameter in cookie

core.session_token

Example:

core.session_token: ********************

Bearer Token

Provide your bearer token in the

Authorization

header when making requests to protected resources.

Example:

Authorization: Bearer ********************

Body Params application/json

Examples

Responses

🟢200

application/json

Bodyapplication/json

🟠400bad-request

🟠401unauthorized

🟠403forbidden

🔴500server-error

Request Example

Shell

JavaScript

Java

Swift

curl --location '/presigned' \
--header 'Content-Type: application/json' \
--data '{
    "fileName": "string",
    "fileType": "image/jpeg",
    "fileSize": 1,
    "type": "LETTER"
}'

Response Example

200 - Example 1

{
    "success": true,
    "message": "string",
    "meta": {
        "page": 0,
        "limit": 0,
        "total": 0
    },
    "errors": [
        {
            "code": "CR-100001",
            "field": "string",
            "message": "string"
        }
    ],
    "result": {
        "uploadUrl": "string",
        "fileUrl": "string",
        "key": "string",
        "expiresIn": 0
    }
}

Modified at 2026-07-27 00:43:20

Resolve External Link Title

Download a Privately Stored File