Synchronize a collection to a folder

How can I correctly sync a collection to a folder, both including subfolders? I tried the synchronize tool with the left pane being a collection, and the right pane being a folder. First of all, when starting the sync tool, it does not use "coll:xxxxx" as the path for the left pane. After clicking on the collection pane, that corrects itself.

However, when clicking synchronize, it always tells me it will update all files and it is treating the folders in my collection as if they had no content inside.