exchange-2.0/app/Classes/General/AWSS3Helper.php

<?php

namespace App\Classes\General;

use Illuminate\Support\Facades\Storage;
use Carbon\Carbon;
use Maatwebsite\Excel\Concerns\Exportable;

class AWSS3Helper
{
    /**
     * @param string $exportFileName
     * @param Exportable $exportableObject
     * @return string
     */
    static function S3Exportable($exportFileName, $exportableObject){
        //Step 1: Upload to S3
        $filePathForS3 = 'temp/' . $exportFileName;
        $exportableObject->store($filePathForS3, 's3');

        //Step 2: Return temporary URL from S3
        $temporaryUrl = Storage::disk('s3')->temporaryUrl(
            $filePathForS3,
            Carbon::now()->addMinutes(10)
        );

        return $temporaryUrl;
    }

    /**
     * @param string $exportFileName
     * @param  string|resource  $contents
     * @return string
     */
    static function S3PDF($exportFileName, $contents){
        //Step 1: Upload to S3
        $filePathForS3 = 'temp/' . $exportFileName;
        Storage::disk('s3')->put($filePathForS3, $contents);

        //Step 2: Return temporary URL from S3
        $temporaryUrl = Storage::disk('s3')->temporaryUrl(
            $filePathForS3,
            Carbon::now()->addMinutes(10)
        );

        return $temporaryUrl;
    }

}