Filename matters, but not practical for product images, but for site design images.
Caption does not impact SEO but is “read 300% more often than site content on e.g. blog pages”.
Alt text does impact SEO “ Be sure to add alt texts. Make sure the alt text includes your SEO keyword and relates to / describes the image. “
Title does not impact SEO
Best way to SEO image, is to include image URL in Sitemap submission to search engine (Google). For Ecom-pages, The product Detail page should be sufficient in sitemap.