I can add a folder to the workspace (which doesn\'t seem to do anything, as far as I can tell), but the \"map to file system resource\" option seems to have been removed, and I
Chrome removed manually mapping to filesystem resources because of the new Workspaces 2.0 (See: https://developers.google.com/web/updates/2017/10/devtools-release-notes).
You should be able to drag and drop your folder into the sources tab and it'll link the files automagically.
However automatic mapping doesn't work in many situations and there is a Chrome bug to re-add manual mapping