Hi I'm new to this site, my bf from the UK tried to visit me in 2023 on ESTA. Long story short, he was denied entry due to not having strong enough ties to the UK. At the time, he was recently unemployed and living in a shared household, basically no assests, in general just bad timing. He has a clean record btw. I (US) have visited him 3 times since then because it was a traumatic experience. We agreed to try for him to visit again and he is actively working on applying for a B2. At this time, hes employed, has an apartment and owns a motorbike. Are there any documents that he should carry for his interview with the US embassy or that we should prepare to have on his person whenever he does cross the border? I've seen people mention having a letter from work and utility bills. We want to make sure nothing happens this time and things go smoothly.