This action is only possible for people with moderator or contributor role.
There are 2 ways in which you can delete files (move them to the trash bin) from CELUM Work:
Delete files manually in the file explorer. This way, you can delete any file (as described in "Move files to the trash bin" section).
Delete files via the CELUM Content robot. This is only possible for files which have been added to CELUM Content.
The deleted files are moved to the trash bin where you can restore them or delete them permanently.