I opened a write-protected and locked PDF-file with the Preview app. Originally it was located within a folder at the desktop.
Afterwards, I moved the file within its folder to a different location.
After some time, the containing folder reappeared at the desktop but without any content in it.
It has been some days since then and I rebooted several times. The folder just keeps reappearing. I delete it, it somehow gets recreated by some application after some minutes.
I even unlocked the PDF-file, moved it back and forth. I also deleted the folder with sudo in the terminal. It says that "staff" is the owner. But it keeps reapperaring.
What could I do? Can I see why the folder was created?