using Aspose.Cells.Cloud.SDK.Api;
using Aspose.Cells.Cloud.SDK.Model;
using Aspose.Cells.Cloud.SDK.Request;
using System;
using System.IO;
using System.Collections.Generic;

string CellsCloudClientId ="....";//get from https://dashboard.aspose.cloud/#/applications
        string CellsCloudClientSecret="...";//get from https://dashboard.aspose.cloud/#/applications
string book1Xlsx = "Book1.xlsx";

IDictionary<string, Stream> mapFiles =new Dictionary<string,Stream>(); 
AddFileParameter(book1Xlsx,mapFiles);       
var request = new DeleteMetadataRequest(
    file: mapFiles,
    type: "all"
);
cellsApi.DeleteMetadata(request);