curl --request POST \
  --url https://api.sftpsync.io/documents/upload-url \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "connectionId": "<string>",
  "filename": "<string>",
  "size": 123,
  "path": "<string>",
  "contentType": "<string>",
  "force": true
}
'

{
  "path": "<string>",
  "url": "<string>",
  "headers": {},
  "uploadId": "<string>",
  "parts": [
    {
      "partNumber": 123,
      "url": "<string>"
    }
  ],
  "partSize": 123
}