In WCMS 3, Site managers can delete media from the website. This includes files, icons, images, and remote videos. When content maintainers remove a document or an image on a web page, it is still stored on the site and can be inserted back.
Permanently Delete a File or Image
The following steps will permanently delete a document or image from the website:
From the administration bar, select Workbench, then select My Dashboard.
Navigate to Media.
Select the drop-down arrow next to either File or Image (depending on the content to be deleted), then select Manage.
Locate the content you want to delete by searching for it by the file name. You can also filter by Published status, or navigate between media types/search all media types using the Type drop-down menu.
Select the checkbox next to the media you want to delete from the site. From the Action drop-down menu, select Delete media.
Select Apply to selected items.
A new page and prompt will appear. Always ensure that the "Also delete the associated files?" box is checked.
Select Delete.