Scott Kelley is among the astronauts who recently went up to the International Space Station and the plan is that he will stay there for a full year. If there is some space flight conspiracy going on then he would have to still be on Earth and if his face were seen anywhere on Earth then it would expose the conspiracy.
Many astronauts in the ISS are quite active on social media and there are even a few people there who started YouTube channels and created videos in space. I know that it's possible to fake some pretty convincing videos, but normal full length movies often take years to make with masive companies like Disney working on them, and NASA releases many videos and photos each day which would take literally thousands of animators, special events artists, and directors who all perfectly collaborate so all their media agrees with it's self and is always consistent. That's not even including space agencies and companies like ESA, JPL, Boeing, Virgin Galactic, SpaceX, and many others as well as every contractor who ever worked for one of those organizations.
I am not kidding when I say that at least half of the world's population to be in on the alleged conspiracy for said conspiracy to do what you flat earthers claim, and it doesn't take a genious to tell you that that's not a very good idea for a conspiracy to do. I just don't know how you flat eathers manage to believe this obvious rubish, you can't even tell me why the Sun sets.