You can easily limit the size of file upload folder using the following methods:

The security policy file (default.config, admin.config and guest.config) can be found in the /CuteEditor/Configuration/Security folder. In security policy file you can find the MaxDocumentFolderSize element which contains the value of max file file upload size limit (in kbs).  By default, it contains the following value:

<security name="MaxDocumentFolderSize">10000</security>
  

You can modify the MaxDocumentFolderSize element to meet your own requirements.

For example:

<security name="MaxDocumentFolderSize">20000</security>

C# Example:

Editor1.Setting["security:MaxDocumentFolderSize"]= "20000";

Editor1.SetSecurityMaxDocumentFolderSize= "20000";

VB Example:

Editor1.Setting("security:MaxDocumentFolderSize")= "20000"

Editor1.SetSecurityMaxDocumentFolderSize= "20000"