Problem with EEG trigger from photodetector recording when importing on Eeglab

Hi,

I am preparing my experiment that uses an EEG equipement with dry electorde (wearable sensing) and a photodetector linked to triggerbox to setup trigger.

On the EEG software I can see that the trigger is well detected but when I make a recording and import it to EEglab, the plotview indicates that there is no events.

I am learning on my own and it's quite difficult, could someone explain if that's a problem or maybe it's because as I'm using an analog input for the trigger, it's not detected as an event in EEglab but the trigger waves has been correctly recorded ?

Thanks in advance,

Léo