My Dropbox files don't preview on the desktop app.

I have changed the computer and opened DB on PC. PC admin is my husband.

I want to open my file and there is a sign ( like a little brown box on each file).

When I click the file - system say is not in the correct format..

Before on my old computer I didn't have this problem.

Any idea? Maybe I need to update the operation system of computer?

I have: Windows 11 Pro, updated in April

Maybe some security issue?

please help 🙂