When I try and create an archive with the files in the image below the process never generates an archive and the blue message never goes away. I have create archives with this setup today whihc have many more files in them.
Under my main admin account (not root but sudo account, i.e. the first account not root you create when setting ubuntu up)
I selected all the files and created an archive. No archive was created. I also while the blue message was running, ran the command you requested, I ran it twice just in-case I missed. The results are below
the blue message box never disappears unless I logout and back in again.
I did the same in the actual clients account but this time the archive was created. the archive creation was too quick for me to run the terminal command
Can you open the browser console with the “Network” tab selected, reload the page, try compressing something in the File Manager, and share a screenshot of the browser console?