There does not seem to be a facility to delete a file once it is uploaded to the "Files" section. Maybe this
is just a permissions thing with the guest account on the demo??
#1 Updated by Jean-Philippe Lang over 10 years ago
As it's said on the demo welcome page, the "guest"
account has limited rights on the sandbox project.
The functionality for deleting files is of course available when
having the right permissions.
Please don't post support requests here. Instead, use the help