index.html as document depending on linked folders

I have successfully installed edocman on Joomla 3.8.3

I uploaded document 'index.html' in category 'training' to /edocman/index.html
inside /edocman/ are also folders 'lib' and 'assets' to which index.html links.
The idea is to load index.html on view and show all contents.

This, however, does not work for me. I can load a blank index.html but it shows no content.
I assume the dependant folders 'lib' and 'assets' have no permissions to be viewed.
How do I fix this?

Hi,
I have answered you through Ticket system
Thanks
Dam