无法让PHP Storm将已部署的文件与本地文件进行比较

I have a directory on my server which has been changed - files and folders added. I want to sync this with the local directory and I cannot get it to work.

This question pretty much covers the problem but the solution hasn't worked for me: PhpStorm does not sync with the server

I right click on the local directory and choose deployment > sync with deployed. It brings up a window to compare differences but then says there is nothing to show.

But by browsing the remote host I can see there are a large number of differences. Changing the compare by filter from content to size, or size and timestamp makes no difference.