why only part-solve?

guys, all of you just need a normal digital asset management cloud software that is integrated with Shopify. here's a list of just a few https://www.capterra.com/digital-asset-management-software/ 

Try this app https://apps.shopify.com/pics-io-import-plugin , works for any number of images, integrates quickly with your Google Drive (100 images upload limit during trial, keep that in mind).