Maybe is because i have to do it right after the end of the mission, cuz i tried a lot of times after failing the first time and i checked a lot of videos with and i saw that i was doing nothing wrong with the hotkeys

i have to start holding the swap button when the first loading screen shoes up?

Edit: i tried more and i did a few save warps but i cant figure out how to do it consistantly

I saw lots of videos of save warping, even the one of dark viper au but I can't understand why it doesn't work, maybe because i click the swap button too late. Anyways i am trying to do it after complications mission