curl --request POST \
  --url https://api.getdecisional.ai/api/v1/data-sources \
  --header 'Content-Type: multipart/form-data' \
  --form 'file=<binary file content>' \
  --form 'data={"name":"Annual Report 2023","type":"file","notes":{"category":"financial"},"knowledge_engine_id":"kng_abc123xyz789"}'

{
  "id": "ds_abc123xyz789",
  "name": "Annual Report 2023",
  "type": "file",
  "status": "processed",
  "notes": {
    "category": "financial"
  },
  "knowledge_engine_id": "kng_abc123xyz789",
  "created_at": 1679644800
}