File/Document Distribution

New to Drupal (been a trial by fire). Everything is set up and working fine (Windows10/Apache2/MySQL/Drupal8). This is an in-house machine and files would be moved directly to the web server. What is the easiest way to dynamically display all files available to my users for download (the goal is to be able to simply add a file(s) to a directory and have it/them available for the client immediately)? Everything is in Directory/File hierarchical order already. For example:

Client1 – Where corporate manager would be dropped (access entire Client1)
Directory1 – Where region manager1 would be dropped (access to all in Directory1)
SubDirectory1 – Where store manager1 would be dropped (access all SubDirectory1)
File1
File2
SubDirectory2 – Where store manager2 would be dropped (access all SubDirectory2)
File1
File2
Directory2 – Where region manager2 would be dropped (only access directory1 and its directories/files)
SubDirectory1 – Where store manager1 would be dropped
File1
File2
SubDirectory2 – Where store manager2 would be dropped
File1
File2
Client2 … etc.

Thank you!
Pat Quick, Jacksonville, FL

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