I want to make a PCB that has an ESP32 on it, and the ESP sends a PWM signal to the motor driver. I want to indicate if the PWM signal is being sent or not by LED, without interfering with the PWM signal.

Is there any particular sensor or way in which I can do this? Prior to this, I tried putting an SMD LED parallel to the PWM signal, but there was some problem the frequency of the PWM that doesn't work with LED.

I have a project that uses all the pins of esp, and the pwm trace goes from one pcb to another via header pins, so I need to make sure that pwm is coming through the headers. Sometimes there may be some mechanical error(in wiring) that might block PWM signals.