Sadio Mane training for Liverpool

What do you think the phrase 'You know?' implies in a conversation?

How can the phrase 'You know?' affect the listener's perception?

In what contexts might someone use 'You know?' and why?

What are some alternative phrases to 'You know?' that convey a similar meaning?

Can the use of 'You know?' indicate a lack of confidence in the speaker? Explain your reasoning.