Can shoppers use a photo instead of their camera for Virtual Try-On?

Yes. In Plugins → Virtual Try-On → Settings, turn on the option that lets shoppers pick a photo from their device. The photo is processed in the shopper's browser only and is never uploaded.

On the same tab you can change the Button label and the Consent text shoppers see before the camera turns on. The Analytics tab shows how many people opened try-on and added to cart.