Post attachmentssignature

curl --request POST \
  --url http://127.0.0.1:3000/api/attachments/signature \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contentType": "image/png",
  "contentLength": 123,
  "type": 1,
  "expiresIn": 3600,
  "hash": "xxxxxxxx",
  "baseId": "<string>"
}
'

{
  "url": "https://example.com/attachment/upload",
  "uploadMethod": "POST",
  "token": "xxxxxxxx",
  "requestHeaders": {
    "Content-Type": "image/png"
  }
}