XLSX Chart Embedder

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/xlsx-chart-embedder' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"workbookFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/xlsx-chart-embedder' \
  -F 'workbookFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'chartsJson=[
  {
    "sheetName": "Charts",
    "chartType": "bar",
    "title": "Monthly Revenue",
    "categoriesRange": "Data!A2:A7",
    "valuesRange": "Data!B2:B7",
    "anchorCell": "B2",
    "widthPx": 520,
    "heightPx": 320
  },
  {
    "sheetName": "Charts",
    "chartType": "pie",
    "title": "Orders Share",
    "categoriesRange": "Data!A2:A7",
    "valuesRange": "Data!C2:C7",
    "anchorCell": "B22",
    "widthPx": 520,
    "heightPx": 320
  }
]'