Problem/Motivation
Admin users can not delete files in the CMS in any way from UI.
There is a hard-coded condition in Drupal\file\FileAccessControlHandler that only the user that uploaded the file can delete it. For then on, this file is permanently present on the system with no way to delete it from the UI for administrator users. Even when they've asserted the file is not in use anywhere or they are OK to risk data corruption by deleting it.
This can lead to resource exhaustion and unhappy clients that see content in the CMS that can not be deleted by them.
Possible workaround:
Decorate the file access check service and change delete action from custom code.
Have the new custom permission implemented so such users can do so.
Proposed resolution
Have a global level permission that can overstep this check.
Remaining tasks
Discussion - why it's implemented so? :(
Patch.
User interface changes
None expected.
API changes
New permission.
Data model changes
None expected.
Release notes snippet
New permission.