Attach an application document

{
  "id": "<string>",
  "company": "<string>",
  "role": "<string>",
  "location": "<string>",
  "salary": "<string>",
  "status": "saved",
  "laneId": "<string>",
  "closedReason": "accepted",
  "resumeId": "<string>",
  "coverLetterId": "<string>",
  "sentResumeVersionId": "<string>",
  "sentCheckScore": -9007199254740991,
  "sentCoverLetterVersionId": "<string>",
  "source": "<string>",
  "tags": [
    "<string>"
  ],
  "sourceUrl": "<string>",
  "jobDescription": "<string>",
  "postingSource": {
    "method": "paste",
    "format": "text",
    "requestedUrl": "<string>",
    "resolvedUrl": "<string>",
    "retrievedAt": "2026-08-10T12:00:00Z",
    "providerFetchedAt": "2026-08-10T12:00:00Z",
    "truncated": true,
    "completeness": "unknown",
    "fallbackReason": "unsafe-url"
  },
  "requirements": [
    "<string>"
  ],
  "matchScore": 0,
  "aiMetadata": {},
  "notes": "<string>",
  "resumeFileUrl": "<string>",
  "resumeFileName": "<string>",
  "coverLetterUrl": "<string>",
  "coverLetterName": "<string>",
  "followUpAt": "2026-08-10T12:00:00Z",
  "followUpNote": "<string>",
  "contacts": [
    {
      "name": "<string>",
      "role": "",
      "type": "",
      "email": "",
      "phone": ""
    }
  ],
  "activity": [
    {
      "id": "<string>",
      "at": "2026-08-10T12:00:00Z",
      "type": "stage",
      "stage": "saved",
      "laneId": "<string>",
      "laneLabel": "<string>",
      "closedReason": "accepted",
      "canonicalTransition": true
    }
  ],
  "appliedAt": "2026-08-10T12:00:00Z",
  "createdAt": "2026-08-10T12:00:00Z",
  "updatedAt": "2026-08-10T12:00:00Z"
}

{
  "defined": true,
  "code": "<string>",
  "status": 1,
  "message": "<string>",
  "data": null
}