if (resourceType == "Image") // Only images are validated here; other types must be disabled in the config
{
    if (!ValidateImage(oFile))
    {
        return;
    }
}

if (oFile == null)
{
    SendFileUploadResponse(202, isQuickUpload);
    return;
}

string serverDir = ServerMapFolder(resourceType, currentFolder, isQuickUpload);
string fileName = Path.GetFileName(oFile.FileName);
fileName = SanitizeFileName(fileName);

string extension = Path.GetExtension(oFile.FileName).TrimStart('.');

if (!Config.TypeConfig[resourceType].CheckIsAllowedExtension(extension))
{
    SendFileUploadResponse(202, isQuickUpload);
    return;
}

if (Config.CheckIsNonHtmlExtension(extension) && !CheckNonHtmlFile(oFile))
{
    SendFileUploadResponse(202, isQuickUpload);
    return;
}

int errorNumber = 0;
int counter = 0;

while (true)
{
    string filePath = Path.Combine(serverDir, fileName);

    if (File.Exists(filePath))
    {
        counter++;
        fileName = Path.GetFileNameWithoutExtension(oFile.FileName) + $"({counter}).{extension}";
        errorNumber = 201;
    }
    else
    {
        oFile.SaveAs(filePath);
        break;
    }
}

TypeConfig typeConfig = Config.TypeConfig[resourceType];
string fileUrl = isQuickUpload ? typeConfig.GetQuickUploadPath() : typeConfig.GetFilesPath();
fileUrl += fileName;

SendFileUploadResponse(errorNumber, isQuickUpload, fileUrl, fileName);

}

</div>A separate image validation method was implemented to ensure only legitimate images are processed: <div>```
// Validates whether the uploaded file is a valid image
private bool ValidateImage(HttpPostedFile file)
{
    bool isValid = false;
    string[] allowedExtensions = { ".jpg", ".png", ".gif", ".bmp", ".jpeg" };
    string extension = Path.GetExtension(file.FileName).ToLower();

    if (allowedExtensions.Contains(extension))
    {
        try
        {
            using (var img = System.Drawing.Image.FromStream(file.InputStream))
            {
                isValid = img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Jpeg) ||
                         img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Bmp) ||
                         img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Gif) ||
                         img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Png);
            }
        }
        catch
        {
            SendFileUploadResponse(110, false, file.FileName, file.FileName, file.FileName);
        }
    }
    else
    {
        SendFileUploadResponse(112, false, file.FileName, file.FileName, file.FileName);
    }

    return isValid;
}

Set the default language to zh-cn for simplified Chinese support. 2. For ASP.NET, open filemanager/connector/aspx/config.asp and set ConfigIsEnabled = true. 3. Encoding issues can typically be resolved by ensuring the latest version is used, as most problems stem from encoding mismatches during file uploads. Challenge 3: Resolving Progress Bar IssuesIf the progress bar hangs during uploads, comment out the following line in the FileWorkerBase class: ``` // Response.Write(@"(function(){...});");

This resolves compatibility issues caused by cross-domain scripting attempts.</div>