upload.js

  async uploadFileMetadata(
    path: string, 
    size: number, 
    type: string, 
    name: string, 
    account: string,
  ) {
    return this.contract.methods
        .uploadFile(path, size, type, name)
        .send({ from: account })
        .on('transactionHash', onSuccess)
        .on('error', onError);
  }