Supervisors can delete documents from cases when needed. There are two ways to delete documents.
One way is to click the 3 dots at the end of the document card and select Delete.
The other way is to use Bulk Operations to delete the document by checking the box to the left of the document card and then selecting Delete at the bottom.
Since only Supervisors can delete documents, it may be helpful to create a case titled cavo/delete and have user move all documents that should be deleted to that case and allow a supervisor to delete them at the end of the day.