This package come with a build-in upload feature. You don't have to do anything to get it work.. expect to upload an image. 😜
If you want to do your own uploader, just register a new route and set it to imageUploadURL configuration option. (Of course you will need to create your own Controller and action, take a look here for an exemple)
If you want to contribute to the project by adding new features or just fix a bug, feel free to do a PR.