If you are using a PHP-based environment (common for Katsem integrations), locate your php.ini file. Look for upload_max_filesize and post_max_size . Increase these values (e.g., to 64M or 128M) to accommodate larger files.
Restart your web server (Apache or Nginx) after making these changes. 2. Verify Folder Permissions
Here is the step-by-step breakdown of how to get your and back on track. 1. Check Your File Size Limits
Sometimes the issue isn't the server—it’s the client. Outdated browser scripts can clash with modern file upload protocols.