Add the below Lightning Component to the Lightning Record page. Sample Code: Aura Component: <aura:component implements="flexipage:availableForRecordHome,force:hasRecordId" access="global" > <lightning:card> <lightning:fileUpload label = "Attach Receipt(s)" name = "fileUploader" multiple ....
Sample Code: Apex Class: public with sharing class AccountController { @AuraEnabled( cacheable = true ) public static List< AccountWrapper > fetchAccounts() { List< AccountWrapper > listWrap = new List< AccountWrapper ....
Sample Query:SELECT Id, Name, (SELECT FirstName, LastName, Title, Email, Phone FROM Contacts), (SELECT Name, StageName, Amount, CloseDate FROM Opportunities), (SELECT CaseNumber, ContactId, Subject, Priority, Status FROM Cases) FROM Account LIMIT ....