If you'd rather not use the product images that come from your POS, you can turn that off in Catalog Settings. Delivery platforms will use their own product imagery instead, and any images you've added directly in Stream are unaffected.
Turning this on
Go to Settings > Catalog Settings.
Switch the toggle on: Don't import POS images
Good to know:
This takes effect from your next catalog sync — images already in your catalog clear then, not immediately.
Delivery platforms will use their own product imagery instead.
Images you add directly in Stream are unaffected and still publish.