The workflow JSON

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{
  "name": "S3_Mock",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "upload_file_mock",
        "responseMode": "responseNode",
        "options": {}
      },
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        -60,
        0
      ],
      "id": "b10d2e31-be52-4cac-963a-a21152150ecf",
      "name": "Webhook"
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "99e2af61-3277-4ab1-8880-5524a1dce910",
              "leftValue": "={{ $json }}",
              "rightValue": "",
              "operator": {
                "type": "object",
                "operation": "notEmpty",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        160,
        0
      ],
      "id": "b4cf9a2e-2b7a-41eb-91af-51c1bf588e8f",
      "name": "If File Exists"
    },
    {
      "parameters": {
        "errorMessage": "File was not able to be uploaded"
      },
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        380,
        100
      ],
      "id": "c72f58cb-146f-4000-a279-8f1d98377cce",
      "name": "Stop and Error"
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "{\n  \"message\": \"Upload successful\",\n  \"etag\": \"\\\"9b2cf535f27731c974343645a3985328\\\"\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.4,
      "position": [
        380,
        -100
      ],
      "id": "0690897f-a190-4a4a-921a-705236407f7f",
      "name": "200 OK"
    }
  ],
  "connections": {
    "Webhook": {
      "main": [
        [
          {
            "node": "If File Exists",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "If File Exists": {
      "main": [
        [
          {
            "node": "200 OK",
            "type": "main",
            "index": 0
          }
        ],
        [
          {
            "node": "Stop and Error",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": true,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "82f9878d-1c90-4601-ae06-df4552e4cf80",
  "id": "lRu44rkIYw7hBWqv",
  "tags": []
}

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