async Task<int> CopyFilesToFolder(List<string> fileList,
        IProgress<int> progress, CancellationToken ct)
    {
        int totalCount = fileList.Count;
        int processCount = 0;

        foreach (var file in fileList)
        {
            string outputFile = Path.Combine(outputPath, file);

            await CopyFileAsync(file, outputFile);

            ct.ThrowIfCancellationRequested();
            processCount++;
            if (progress != null)
            {
                progress.Report(processCount * 100 / totalCount);
            }

        }

        return processCount;
    }


    private async Task CopyFileAsync(string sourcePath, string destinationPath)
    {
        using (Stream source = File.Open(sourcePath, FileMode.Open))
        {
            using (Stream destination = File.Create(destinationPath))
            {
                await source.CopyToAsync(destination);
            }
        }
    }