I am trying to add tags to files when they are uploaded to my Drupal site in a structured way, so that they are categorized. The goal is to have the files uploaded and separated into either tag1 or tag2 depending on a dropdown box a user selects from a 3rd party site I have. Also when the files are uploaded I want to be able to separately view the files depending on what tag they are under, but I can't seem to figure out how to do this.
Currently this is my setup on drupal. I have a c# application doing a api post request and attaching a tag through a drop down list, but I mostly want to know how to configure the drupal site correctly.
How can I upload files and apply a tag to them correctly, and view the content on my Drupal site displaying them in their correct tags?
[![file content structure][2]](https://i.stack.imgur.com/eKdb4.png)