How put footnote in table?

I need make footnotes in table, but it’s unactive for them. What I did wrong?

Which LibO module are you using?

Simple, that is build inside LibreOffice. I found that it’s depend from table. In some tables it’s possible in some it’s not. But not clear dependences.

Sorry for asking again questions instead of providing answers. But why and how to you make footnotes in a table? What kind of table?