The ESP32 and the Nano33 iot use 3.3V for any in-/outputs !!! A suggestion for ESP32 pinout is in the PDF. Don't use pins GPIO 0, 6-12. The pins 33-39 are input only, and don't have pullup resistors.

ESP32-CAM development board (AI-Thinker model recommended) FTDI programmer or similar USB-to-Serial adapter for uploading code 5V power supply capable of delivering at least 500mA ...