Audio Analysis with ML Nicla Voice and Edge Impulse

I am referring to the guide written by Benjamin Dannegard and Jose Bagur

My problem is deploying the model in Edge Impuse Have successfully created a model but now need to upload to Nicla Voice.

I cannot see a 'Build firmware' selection and nowhere can I see where to select Arduino Nicla Voice. There are 'Custom Block' and 'Custom firmware' selections

Under Syntiant NDP101 library I find some choices but these do not include Arduino Nicla Voice

Help with this would be much apreaciated.