So ...

Yes, I'm talking about a FTP-like file manager that can help you to upload files, to download files, and more importantly, to edit Wordpress configuration files, themes, plugins, and other files right from your Wordpress dashboard.

And yes, I'm talking about a handy, lightweight (320KB) plugin called FileManager:

https://wordpress.org/plugins/wp-file-manager/

Upon activation, the plugin will add a new menu item labeled "WP File Manager" in your admin sidebar.

Clicking on it will launch the file manager, which will show your current WP installation with all your files and folders:

OK. Let's see how it works ...