Laravel Spark profile picture returning 403 error

When I update the profile picture on my Laravel (5.5) Spark (5.0) app, although it uploads the picture correctly, it does not display in the app.

My APP_URL entry in .env is correct.

I have run php artisan storage:link.

I have confirmed that the image in the database (/storage/profiles/fPLKc4SXY8ivpMGublIiNtZx2ZGjdcPq7f2kAHBV.jpeg) exists in storage/app/profiles and in public/storage/profiles.

But when I look at the Network tab in Chrome it shows a 403 error when it tries to fetch the image.