Laravel file storage URLs work locally but 404 on a real server

I'm working with a custom file storage disk and it works as expected on my local machine, but on my Forge server the generated asset URLs don't work.

My filesystem config looks like this:

'disks' => [

    'local' => [
        'driver' => 'local',
        'root' => storage_path('app'),
    ],

    'public' => [
        'driver' => 'local',
        'root' => storage_path('app/public'),
        'url' => env('APP_URL').'/storage',
        'visibility' => 'public',
    ],

    'assets' => [
        'driver' => 'local',
        'root' => storage_path('app/public/assets'),
        'url' => env('APP_URL').'/assets',
        'visibility' => 'public',
    ],

];

I have a file at {myapp root}/storage/app/public/assets/file.jpg and I'm generating URLs with Storage::disk('assets')->url('file.jpg'); and this works fine, it gives me the expected URL, which is (locally) myapp.test/assets/file.jpg. In production I get the correct URL as well, myapp.com/assets/file.jpg, but this link 404s. If I insert "storage" into the URL, so that it's myapp.com/storage/assets/file.jpg, it works.

I've php artisan storage:linked everything in both environments, everything else is exactly the same, but on a real server the URLs all 404.

Help!!

via Chebli Mohamed