Select all (and unselecting all) is a known gap that we hope to put in upcoming releases.
The ability to zip and unzip functionality I’m not so sure about - at least I don’t recall it being exposed as a feature the user can interact with. That is, when you download a directory - it zips it and you download the .zip file. But you as a user cannot press a button for zipping for example. Looking at the image on the link you’ve given I don’t see any such button, though I haven’t used that library in some time I could have forgotten it.