Hi kun,
Try this way:
Open file: CuteSoft_Client\CuteEditor\Dialogs\InsertImage.aspx
Find section below:
<CE:Uploader id="InputFile" runat="server"></CE:Uploader>
Change to:
<CE:Uploader id="InputFile" runat="server" UploadType="IFrame"></CE:Uploader>
Regards,
ken