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AnonymouseAnonymouse 

How may I find out the file name?

Hello,

How may I find out the file name of a file being uploaded in the following embedded code? Where may I add this? Do I create an Apex class?
<apex:page standardController="CustomObject__c"
           extensions="box.DisplayWidget"
           showheader="false"
           sidebar="false"
           action="{!GetLoginToken}">
<apex:stylesheet value="{!URLFOR($Resource.box__BoxEmbed, 'BoxEmbed/style.css')}"/>
<apex:iframe src="/apex/box__BOXSection?id={!CustomObject__c.Id}&param=CustomObject_Box_Section"
             rendered="{!DisplayBoxSection}"/>
<apex:iframe src="{!folderShareLink}"
             rendered="{!DisplayBoxWidget}"
             width="100%"
             height="100%"
             frameborder="0"
             scrolling="NO"/>
</apex:page>
Sincerely,
Anon