Dividend tax from US stocks through Vested

(1) I have invested in US stocks through “Vested”. I am getting notifications for the dividends, where the dividends are getting deposited? Is it deposited in my Vested demat account?

(2) Is it possible to reinvest the dividends into the same stock/ETF/index funds?

(3) I am being charged for dividend tax immediately after receiving the dividends. So, what is the tax % here? It is not clear and I am unable to find in the following link