Are you getting the error: "The Mix manifest does not exist" when the file exists? Try rebinding the public path.

AppServiceProvider.php

/**
| Upon getting this error on a production environment in which you cant install `npm` to run
| `run npm dev` or `run npm production` to compile the assets, you can add this to the `boot()` method of your `AppServiceProvider.php`
| to bind a new path to the existing manifest of your application.
*/

//...


/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    //...
    
    $this->app->bind('path.public', function() {
        return base_path().'/../public_html';
    });
}

//...