curl --request POST \
  --url https://api.sandbox.getasset.com/v0/business/{business_id}/document \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'files=[
  null
]' \
  --form document_type=receipt \
  --form 'description=<string>' \
  --form 'task_id=<string>'

{
  "data": {
    "task_id": "tsk_R2fAXCjqJPdpYata112zyW",
    "business_id": "biz_R2fAXCjqJPdpYata112zyW",
    "name": "receipt.pdf",
    "description": "Receipt",
    "document_type": "receipt",
    "file_size": 1024,
    "status": "processing",
    "id": "doc_R2fAXCjqJPdpYata112zyW",
    "created_at": "2023-11-07T05:31:56Z"
  }
}