Download previously uploaded file via submission. This API will send a 302 redirect response and redirect to a signed URL to download the file. The file itself is not in the initial 302 redirect response itself.
GET /api/v2/download/12345/12345 HTTP/1.1 Host: www.formstack.com Authorization: Bearer [[app:oauth_token]]
curl -O -H "Authorization: Bearer YOUR_APP_OAUTH_TOKEN" https://www.dev-formstack.com/api/v2/download/12345/12345