Images uploaded through forms return 403 unless logged in

I have a functionality, where i let visitors upload images through Umbraco Forms. But the images return 403 on the front end, unless i’m logged in to the backoffice.

How do i fix this?


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/114251-images-uploaded-through-forms-return-403-unless-logged-in