curl --request POST \
  --url https://api.vmeg.ai/openapi/v1/assets/material/upload/multipart/initiate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Idempotency-Key: <x-idempotency-key>' \
  --data '
{
  "fileHash": "<string>",
  "fileName": "<string>"
}
'

{
  "code": 200,
  "message": "",
  "data": {
    "materialId": "<string>",
    "s3Uri": "<string>",
    "uploadId": "<string>",
    "expiresInSeconds": 123,
    "recommendedPartSize": 123
  }
}