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)
The `sizeLimit` parameter must be a number. Be aware that the unit is in KB. When setting this value high, you should make sure to also configure the body parser middleware `maxFileSize` so the file can be sent and processed. Read more [here](https://strapi.io/documentation/3.0.0-beta.x/plugins/upload.html#configuration)