ASP.NET by default allows the maximum file size upload to be 4 MB. If you use a third-party ASP.NET File Upload to upload large files and you receive a notification that the upload has failed due to the maximum file size limit, then the respective component does not support large file uploads.

In order to override the maximum file size restriction, you need to modify the web.config file and enable the file upload process to handle larger files. With C1Upload you can quickly upload files over 4 MB.