DevExtreme- dxFileUploader not uploading file greater than 5 MB

Hi Support,

We are trying to upload pdf file greater than 5 MB in size but it's not happening. We are getting exception "Maximum request length exceeded" (server side).
We have followed following link to achieve.
https://js.devexpress.com/Demos/WidgetsGallery/Demo/FileUploader/Validation/jQuery/Light/And below is our code:

JavaScript
.dxFileUploader({  
          multiple: true,  
          accept: "*",  
          invalidMaxFileSizeMessage: "File size is too large",  
          uploadFailedMessage: "Upload failed",  
          maxFileSize: 100000000, // this is not working, how can we set max file size as it is not taking more than 5 MB  
          uploadMode: "useButtons",  
          value: [],  
          uploadUrl: "/pdrive/home/uploadfiles?ENTITYID=" + entityID + "&SYSTEMMENUID=" + sysmenuID,  
          onValueChanged: function (e) {  
              debugger  
              var files = e.value;  
              count = files.length-1;  
              $.each(files, function (i, file) {  
                  debugger  
                  filename = file.name;  
                  filetype = file.type;  
              });  
          },  
          onUploaded: function (e) {}  
});  

So please let us know how can we increase file size to be uploaded?
Attaching a file more than 5 MB in size so that you could check.