curl --request PUT \
  --url https://api.sandbox.goteal.co/documents/bank-statements/presign \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "files": [
    {
      "file_name": "hsbc-january-2024.pdf",
      "external_id": "ext-stmt-2024-01"
    }
  ]
}
'

{
  "presigned_urls": [
    {
      "file_name": "hsbc-january-2024.pdf",
      "presigned_url": "https://s3.amazonaws.com/bucket/presigned-upload-key?signature=abc123",
      "path": "client/acct123/users/user456/stmt1.pdf",
      "external_id": "ext-stmt-2024-01"
    }
  ]
}