The path admin/content/files is missing in Drupal 8.5 I have installed Drupal 8.5 and today I realised that the tab admin/content/files is missing. Thanks to my backups I realized that this tab link is already missing since the 14th of March. Prior to the disappearance on the link I did not install any module. How can I solve this issue?
I had the same problem and was because the route that creates the page (view.files.page_1) was not recognized by Drupal. Why? I don't know, but I reinstalled the Views UI and the Views module and the problem was solved.

You can read about this problem in Add Item for Files under Content Menu and this is why we added in the Admin Toolbar module a validation for the route. The file module can be installed and the route can be missed from the site.