Your configuration is passed down to the cloudinary configuration. (e.g: `cloudinary.config(config)`). You can see the complete list of options [here](https://cloudinary.com/documentation/cloudinary_sdks#configuration_parameters)
See the [using a provider](https://strapi.io/documentation/developer-docs/latest/plugins/upload.html#using-a-provider) documentation for information on installing and using a provider. And see the [environment variables](https://strapi.io/documentation/developer-docs/latest/concepts/configurations.html#environment-variables) for setting and using environment variables in your configs.