Create lighting web component as an action in record detail page in salesforce to allow users to download all related files on opportunity with a single click and consider time out issues as i tried to create it today and it has this issue sometimes worked sometimes not and there zip file solutions try to depend on resources like salesforce stack overflow , salesforce ben and with your recommended solutions considering these things mentioned above

The apex code

public with sharing class OpportunityFilesController {

@AuraEnabled(cacheable=false)

public static List<FileWrapper> getOpportunityFiles(Id oppId) {

List<FileWrapper> results = new List<FileWrapper>();

// Get all files linked to Opportunity

List<ContentDocumentLink> links = [

SELECT ContentDocumentId, ContentDocument.Title,

ContentDocument.LatestPublishedVersionId

FROM ContentDocumentLink

WHERE LinkedEntityId = :oppId

];

// Fetch file versions

for (ContentDocumentLink l : links) {

ContentVersion v = [

SELECT Id, Title, FileExtension, VersionData, ContentSize

FROM ContentVersion

WHERE Id = :l.ContentDocument.LatestPublishedVersionId

LIMIT 1

];

// ⚠️ Add limit to avoid hitting heap size

if (v.ContentSize < 3000000) { // 3MB limit per file for safety

results.add(new FileWrapper(

v.Title + '.' + v.FileExtension,

EncodingUtil.base64Encode(v.VersionData)

));

} else {

// Instead of crashing, skip large file

results.add(new FileWrapper(

v.Title + '.' + v.FileExtension,

null,

true

));

}

}

return results;

}

public class FileWrapper {

@AuraEnabled public String fileName;

@AuraEnabled public String base64Data;

@AuraEnabled public Boolean skipped;

public FileWrapper(String f, String b) {

fileName = f;

base64Data = b;

skipped = false;

}

public FileWrapper(String f, String b, Boolean s) {

fileName = f;

base64Data = b;

skipped = s;

}

}

}

Html code

<template>

<lightning-card title="Download Files">

<lightning-button

variant="brand"

label="Download All Files"

onclick={handleDownload}

disabled={isLoading}>

</lightning-button>

<template if:true={isLoading}>

<lightning-spinner size="medium"></lightning-spinner>

</template>

</lightning-card>

</template>

Javascript code

import { LightningElement, api, track } from 'lwc';

import getOpportunityFiles from '@salesforce/apex/OpportunityFilesController.getOpportunityFiles';

import JSZip from '@salesforce/resourceUrl/jszip';

import { loadScript } from 'lightning/platformResourceLoader';

export default class OpportunityDownloadFiles extends LightningElement {

@api recordId;

isLoading = false;

jsZipInitialized = false;

renderedCallback() {

if (this.jsZipInitialized) return;

this.jsZipInitialized = true;

loadScript(this, JSZip + '/jszip.min.js');

}

async handleDownload() {

this.isLoading = true;

try {

const files = await getOpportunityFiles({ oppId: this.recordId });

const zip = new JSZip();

files.forEach(file => {

if (!file.skipped && file.base64Data) {

const content = atob(file.base64Data);

const arrayBuffer = new Uint8Array(content.length);

for (let i = 0; i < content.length; i++) {

arrayBuffer[i] = content.charCodeAt(i);

}

zip.file(file.fileName, arrayBuffer);

}

});

const blob = await zip.generateAsync({ type: 'blob' });

const link = document.createElement('a');

link.href = URL.createObjectURL(blob);

link.download = 'OpportunityFiles.zip';

link.click();

} catch (error) {

console.error(error);

} finally {

this.isLoading = false;

}

}

}

Please i want your input if they are correct