{
  "operation": "Upload File To Source",
  "method": "POST",
  "path": "/v1/sources/{source_id}/upload",
  "auth": "Bearer token (LETTA_API_KEY)",
  "request": {
    "method": "POST",
    "path": "/v1/sources/source-ae-01/upload",
    "headers": {
      "Authorization": "Bearer $LETTA_API_KEY",
      "Content-Type": "multipart/form-data"
    },
    "body_form": {
      "file": "@/path/to/notes.pdf"
    }
  },
  "response": {
    "status": 202,
    "body": {
      "job_id": "job-9a",
      "status": "queued",
      "message": "File queued for ingestion."
    }
  }
}