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VF page showing Files for parameter ID

I have been trying to recycle some code that I used to show a related list on a record, but I've hit the limit of my knowledge (I'm not a real developer).

My goal is to have a button on an opportunity that will take the user to a VF page that shows all related files, but allows them to see more columns than the standard SF page.

This is the page and extension I'm fumbling with.  The query works for sure, but all I'm now seeing any data on the page.  It's like I'm not calling the method correctly.  I'm using this url to pass in the oppID parameter, /apex/OpportunityFiles?oppID=0062F000002nIy8QAE

<apex:page standardController="ContentDocumentLink" extensions="OpportunityFilesExtension" >

<apex:pageBlock title="Files">
   <apex:pageBlockTable value="{!oppFiles}" var="contact">
      <apex:column value="{!contact.ContentDocument.Title}"/>
       <apex:column > 
            <apex:facet name="header">Title</apex:facet>
            <apex:outputText value="{!contact.ContentDocument.Title}"></apex:outputText>

public class OpportunityFilesExtension {

    //public List<ContentDocumentLink> oppFiles = new List<ContentDocumentLink>();
    public List<ContentDocumentLink> oppFiles {get; set;}
    public string oppID {get; set;} //holder for passed in Opp ID
    public OpportunityFilesExtension(ApexPages.StandardController controller) {
    oppID = ApexPages.currentPage().getParameters().get('oppID');
    system.debug('oppID is '+oppID);
    //public OpportunityFiles(ApexPages.StandardController controller) {
      //  this.opp= (Opportunity)controller.getRecord(); //get the ID of the current opportunity
    public List<ContentDocumentLink> getFiles()
         system.debug('oppID in getFiles is '+oppID);
        if (oppID == null)
         return null;
        oppFiles = [SELECT ContentDocumentId,Id,LinkedEntityId, ContentDocument.Title, 
					ContentDocument.ContentSize, ContentDocument.Description, 
					ContentDocument.FileExtension, ContentDocument.Owner.Name, 
					FROM ContentDocumentLink WHERE LinkedEntityId = :oppID AND ContentDocument.FileExtension != 'snote'
					limit 5 ];
        return oppFiles;