iPadOS, file search not working

Hi all!

The file search in my iPadOS 13.6 has suddenly stopped working.

For example, when I open the list of files in the iCloud Drive, I see some file.

But if I type its name in the search bar, I see "No results" :(

What should I to to enable file search on my iPad? Thank you!

The problem is on LTE and WiFi (no difference).