I am starting a site with similar functionality to a stock photo site. So tens of thousands of images that can be accessed via a membership payment. Is Shopify the best platform for a site like this? Will it be fast enough? Is it easy to upload large volumes of images? Thanks in advance for any advice.
Shopify is definitely not the best place to sell stock photo online. If I were you, I will set up my own website, maybe on Wordpress if you're not tech-savvy.