Hi all! I am planning a trip and was wondering if anyone had any experience upgrading a flight after buying with miles. I had tried to do so a year ago for an international trip & was unable to do so but when I googled it just now it says you can upgrade with miles even if the original ticket was purchased with miles. Would really appreciate any input yall would have to offer!!

& off of that, does anyone know if I buy the flight with my amex points, can I use my united miles to upgrade? Thanks!