File not uploading properly when use MTOM in SoapUI

I am using SoapUI 5.1.3 version. I am sending below request to the we service.

<soapenv:Envelope       xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:upl="http://upload.application.carbon.wso2.org" xmlns:xsd="http://upload.application.carbon.wso2.org/xsd">
   <soapenv:Header/>
   <soapenv:Body>
      <upl:uploadApp>
         <!--Zero or more repetitions:-->
         <upl:fileItems>
            <!--Optional:-->
            <xsd:dataHandler>UEsDBBLjAuMC52MjAxMTA1MjcxNTIxMDAvYXJ0aWZhY3QueG1sUEsFBgAAAAAJAAkAMAMAAC4IAAAAAA==</xsd:dataHandler>
            <!--Optional:-->
            <xsd:fileName>ESBproject1-1.0.0.car</xsd:fileName>
            <!--Optional:-->
            <xsd:fileType>jar</xsd:fileType>
         </upl:fileItems>
      </upl:uploadApp>
   </soapenv:Body>
</soapenv:Envelope>

at the web service end, when I check the dataHandler value seems like it is truncated at the end of the string. I inserted file using Insert file as Base64 context menu option. I changed Enable MTOM property to true. what could be the reason for missing a part of data that sends to web service?