Numbers: Save manually on iPad

Hi there.

I love using Numbers on iPad, I have a spreadsheet for my financials and use it every day.

So it is nice to have it on iPad and on the Mac itself.

My issue is though, that sometimes I make a change and close the app and it did not save

it. Every day I got some changes it does not save. I would like to know how to save manually

or how to see that it saved, or know when it saves..

I just don't know when it does which os stupid.....

Thanks in advance!

Stay save!

Cheers!