Strapi won't upload in prod

Question

I installed in my folder the

yarn add strapi-provider-upload-cloudinary graphql

Registered at cloudinary and followed the steps

However production is broken with the following error while trying to upload to library

Error: Internal Server Error
    Cf https://xxxx.herokuapp.com/admin/main.xxxx.chunk.js:1

Also in dev when I do the query the image url is still the local one:

user_12413190 · Answer

Here is the solution which worked for me Heroku config