I routinely use Dropbox to temporarily share files and to swiftely delete *and* and then "permantely delete" the file using the Dropbox web interface.
Despite doing this for years, and perhaps as recently as 3 months ago, I now find that I am unable to do this. I activate "Show deleted files", select the deleted file, and click on the 3 dots [...] and am only shown 3 options: File Info, Restore, File Activity.
This is a private Dropbox account, not linked to work or an organisation.
What do I need to do to permantely delete a file?