Directory is not created

First of all Happy New Year and thank you for this plugin!

I’m trying to use it to make sure that all media assocaited with a particular type of posts are stored in the same directory in order to restrict the access to this folder so only selected users/roles may have access to the files.

The template I′m using is “/%post_type%/%post_id%”.
When I′m testing it with some posts in the settings page it seems to work fine, however:

a) The directory is not created.
b) All added media ends up in the standard /wp-content/uploads folder

At the moment I am trying the plugin on a development PC runing on WAMP, and I’m wonder if this is part of the problem.
When doing a test for a post the resulting path is “C:\wamp64\www\XXX/wp-content/uploads/page/15” (I’ve replaced the name of the site with XXX), but the interesting part is the mixture of slashes and backslashes.
Is this correct?

Thanks in advance for your suggestions.

Best regards:

Eric