Old document version after opening? (Impress)

Hi,
I saved and closed a presentation, but after opening it again it was an older version. How can that be? I’m really disappointed of LibreOffice bacause I lost 3 hours of work.
I can’t find the backup files, even if it automatic saving is turned on.
Ideas?

Can you make sure that you actually did open the same file, see Recent files in the File menu.

Of course I did open the same file.

Oh, you’re right, I opened another file before saving.

Glad you got it sorted. I post this as the answer as well, so the question doesn’t appear unanswered.

Can you make sure that you actually did open the same file, see Recent files in the File menu.