Today, Loop asked me to restart so that I could be fed with an update. Naturally, after the restart, release notes were missing, but I found something online about this.
Microsoft have posted Streamline your workflow with file uploads to Loop workspaces about this new feature.
This means you can now upload PDF files and the most common Microsoft Office files and use them as pages in Loop. That's it.
They have broken the export to PDF functionality where columns with a LABEL type no longer display the label data in the exported PDF. This use to work in previous versions.