<?php

public function generatePath()
{
    $attempts = 5;

    for ($i = 0; $ i<= $attempts; $i++) {
        $path = 'public/photos/'. Str::random(40). '.jpg';

        if (!Storage::exists($path) {
            return $path;
        }
    }

    throw new Exception('Can\'t find a file name');
}