Unable to locate file via the known mount points

[ghost]

Hello and thank you for having come up with this extension which provides the functionality I was looking for.

I have created a directory /root/linked-storage where I put my files. I also set up the configuration like this:

ckanext.linked_storage.mountpoints = /root/linked-storage/

For the resource creation, I am using the API like this:

curl -X POST -H "Authorization: XXXX" http://ckan-host.com/api/3/action/resource_create --form package_id=package --form name=big_file --form url_type=link-storage --form link_path=/root/linked-storage/big-file

but I get the following error:

{"help": "http://ckan-host.com/api/3/action/help_show?name=resource_create", "error": {"message": "Unable to locate file via the known mount points", "__type": "Validation Error"}, "success": false}

Have I missed something in the set up? Do I need to use the ckanext.linked_storage.net_paths config as well?

Best regards