<template>
    <lightning-card title="File Preview v3" icon-name="custom:custom11">
      <div class="slds‐m‐around_small">
       <template if:true={filesList}>
          <table class="slds-table slds-table_bordered slds-table_cell-buffer">
             <thead>
                <tr class="slds-text-title_caps">
                   <th scope="col">
                      <div title="Key">File Name</div>
                   </th>
                   <th scope="col">
                      <div title="Value">File Extension</div>
                   </th>
                </tr>
             </thead>
             <tbody>
                <template for:each={filesList} for:item="keyValue">
                   <tr key={keyValue.Id}>
                      <th scope="col">
                         <div>{keyValue.Title}</div>
                      </th>
                      <th scope="col">
                         <div>{keyValue.FileExtension}</div>
                      </th>
                   </tr>
                </template>
             </tbody>
          </table>
       </template>
       </div>
    </lightning-card>
 </template>




import { LightningElement,api,wire } from 'lwc';
import cvRecords2 from '@salesforce/apex/contenVersionFilePreview.cvRecords2'
export default class ContentVersionV3 extends LightningElement {
    @api recordId;
    wiredActivities;
    filesList =[];

    @wire(cvRecords2, {recId: '$recordId'})
    wiredclass(value){
        this.wiredActivities = value;
        const { data, error } = value;
        if (data) { 
            console.log(data)
            this.filesList = data;
            console.log('Data========> '+JSON.stringify(this.filesList));
        }
        if(error){ 
            console.log(error);
        } 
    }
}



Apex

public class contenVersionFilePreview {
    @AuraEnabled(cacheable = true)
    public Static  List<ContentVersion> cvRecords2(String recId){
        set<Id> SetIds = new Set<id>();
        list<Account> lstAccount = [Select Id,(Select Id From Contacts),(Select Id From Opportunities) from Account where Id = :recId];
        for(Account Acc : lstAccount){
            SetIds.add(Acc.Id);
            for(Contact con : Acc.Contacts){
            SetIds.add(con.Id);
        	}
            for(Opportunity opp : Acc.Opportunities){
            SetIds.add(opp.Id);
        	}
        }
           List<ContentDocumentLink> files = [SELECT ContentDocumentId FROM ContentDocumentLink WHERE LinkedEntityId = :SetIds];
            List<ID> fileIDs = new List<ID>();
            for (ContentDocumentLink docLink : files) {
                fileIDs.add(docLink.ContentDocumentId);
            }
            List<ContentVersion> docs = [SELECT Id,ContentDocumentId, FileExtension, Title 
                						 FROM ContentVersion WHERE ContentDocumentId IN :fileIDs];
          
            return docs;
    }
}