At what point are you actually required to disclose your current salary during the interview process? I had one recruitment agent actually asked me to bring do

At what point are you actually required to disclose your current salary during the interview process? I had one recruitment agent actually asked me to bring documentary evidence of my current salary with me to the onboarding interview. I did at the time, but I have no desire to work with that recruiter again, especially as they lied to me about the nature of one of the interviews I would be attending. The whole process ended up feeling really shady.