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Patricia LimPatricia Lim 

Apex:inputFile on VF page with pre-existing controller

I would like to add document upload functionality to my VF page of which already has a custom controller defined. When I use extension controllers it simply returns the error: `Unknown constructor 'documentExt.documentExt(c2 controller)'`

I consolidated my extension controller code into my custom controller, but it doesn't seem to be doing anything:
User-added image
Here is my controller code: 
public class c2{
    public scholarship_award__c sch {get;set;}
    public recipient__c rec {get;set;}
    public document doc {get;set;}
    
    public c2(){
        sch = new scholarship_award__c();
        rec = new recipient__c();
    }
    
    public void saveScholarship(){
        insert rec;
        sch.Recipient__c = rec.Id;
        insert sch;
        sch = new scholarship_award__c(Recipient__c=rec.Id);
   		rec = new recipient__c();
    }   

    	public void documentExt(ApexPages.StandardController controller)
    {
        Document d = (Document)controller.getRecord();
        d.folderid = UserInfo.getUserId(); //Put in personal documents
    }    
}
VF page: 
<apex:page showHeader="False" applyHtmlTag="true" applyBodyTag="false" controller="c2" lightningStyleSheets="True" extensions="c2">
<head>
   <apex:slds >
    <body class="slds-scope">
    <apex:form >
        <apex:pageBlock title="Academic Year 2020-2021">
        <apex:pageBlockSection columns="2" title="Add Scholarships">
            <apex:inputField value="{!rec.Name}"/>
            <apex:inputField value="{!rec.Last_Name__c}"/>S
            <apex:inputField value="{!rec.Preferred_Name__c}"/>
            <apex:inputField value="{!sch.School__c}"/>
            <apex:inputField value="{!sch.Year__c}"/>
            <apex:inputField value="{!sch.Award__c}"/>
            <apex:inputField value="{!rec.Email__c}"/>
            <apex:inputField value="{!rec.Specialty__c}"/>
            <apex:inputField value="{!rec.school__c}"/>
        </apex:pageBlockSection>      
            <div align="center" >
            <apex:inputField value="{!rec.Biography__c}" style="width: 100px; height:40px"/>           
            </div>	
        <apex:pageBlockButtons location="bottom">
            <apex:commandButton action="{!saveScholarship}" value="Submit"/>
            </apex:pageBlockButtons>
        </apex:pageBlock>
    </apex:form>
    </body>
   </apex:slds>
</head> 
</apex:page>

Thanks