Accessing firebase storage folders

I have two different categories of files to save, but it seems to be that just simply changing the bucket as [URL]/[Folder name] won't allow me to access the files inside the folder. Can anyone please help me to access the files inside a created folder?

Take 10 minutes to read about Firebase on TimAI2's website. This is a link to the first guide of several on site:

Herewith a more direct link, with regards to Firebase Storage: