Hi ,

I have the following controller and Vf page that adds one attachment

controller:

public with sharing class OpportunityAttachmentController{
  
    public Opportunity_Attachment__c objOppAtt {get; set;}
 
    public OpportunityAttachmentController(ApexPages.StandardController controller) {
        attach = new Attachment();
        objOppAtt = (Opportunity_Attachment__c)controller.getRecord();
     
    }

    public Attachment attach {get;set;}
    public Attachment attach1 {get;set;}
 
    //When user clicks upload button on Visualforce Page, perform upload/insert

    public ApexPages.Pagereference save(){
        if(attach.body==null){
            ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Please select a file to upload'));
            return null;
        }
        insert objOppAtt;
     
      
        attach.ParentId = objOppAtt.id;
        insert attach;
      
       
        objOppAtt.URL__c = URL.getSalesforceBaseUrl().toExternalForm()+'/servlet/servlet.FileDownload?file='+attach.id;
        objOppAtt.name = attach.Name;
        update objOppAtt;
      
        return new PageReference('/'+objOppAtt.Opportunity__c); 
    }
  
  
  
  
  
}


VF page:
<apex:page standardController="Opportunity_Attachment__c" extensions="OpportunityAttachmentController">
    <apex:sectionHeader title="New Opportunity Attachment" subtitle="Opportunity Attachment Edit"/>
    <apex:form >
        <apex:pageBlock >
            <apex:pageMessages />
            <apex:pageBlockSection columns="1">
              
                <apex:outputField value="{!Opportunity_Attachment__c.Opportunity__c}"/>
                <apex:pageBlockSectionItem >Upload Contract<apex:inputFile required="true" value="{!attach.body}" filename="{!attach.name}" /></apex:pageBlockSectionItem>
              
            </apex:pageBlockSection>
            <apex:pageBlockButtons >
                <apex:commandButton value="Upload" action="{!save}"/>
            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>
</apex:page>


I want to add one more attachment  so i modify the vf as follows:
<apex:page standardController="Opportunity_Attachment__c" extensions="OpportunityAttachmentController">
    <apex:sectionHeader title="New Opportunity Attachment" subtitle="Opportunity Attachment Edit"/>
    <apex:form >
        <apex:pageBlock >
            <apex:pageMessages />
            <apex:pageBlockSection columns="1">
             
                <apex:outputField value="{!Opportunity_Attachment__c.Opportunity__c}"/>
                <apex:pageBlockSectionItem >Upload Contract<apex:inputFile required="true" value="{!attach.body}" filename="{!attach.name}" />
            <apex:pageBlockSectionItem >Upload Attributes<apex:inputFile required="true" value="{!attach.body}" filename="{!attach.name}" />
</apex:pageBlockSectionItem>
             
            </apex:pageBlockSection>
            <apex:pageBlockButtons >
                <apex:commandButton value="Upload" action="{!save}"/>
            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>
</apex:page>


do i have to write a seperate controller,or i can modify the same?If modify the same ,how?