If you want to load some data in your R transformation but it can't be stored in a table, you can now use Saved Files feature. This allows you to specify multiple tags and for each tag the engine will download the latest stored file in File uploads with this tag. If no file is found, the transformation will fail. The files are then stored in /data/in/user/{tag} and the manifest files in in /data/in/user/{tag}.manifest.
This comes extremely handy when you externally pre-generate binary data for a transformation (model, bucketing criteria). You just upload the file to the File upload and assign a certain tag, that you will then use in a transformation.