Files shared in mIKs-it kids that have been approved by their grown-up belong to the creator, the person who has created the file. By using mIKs-it, you give permission to use the files only in mIKs-it and will respect the creator rights not to share it in other platforms.
This means you can’t download nor copy and use files outside of the app. If you’d like to do this, you must speak to the file creator directly and discuss it outside mIKs-it.