Please help to understand Meteor-Files package

Hello guys. I am trying to work Meteor-Files
However it uses some concepts I am not quite familiar with. Also the documentation seems to be very inconsistent and complicated or maybe it’s some language barrier.
Anyway I created a simple app and trying to get it working with react.
I used some codes from the docs and demo apps but still can’t make it work
Here are the links to the codes that I am using

And here is my repo.

For now in the client I get files undefined. I tried some variables renaming, some import and exporting (as I do usually with the collections) but nothing works.
If any of you worked with this package, please can you help me to get some understanding on it?
Thank you.