Collection cover image and English name

The "Details" card has two optional fields. "Cover image (optional)" is a single banner picture for the collection — tap "Add cover"; PNG, JPG or WebP up to 8 MB is allowed. "English name (optional)" is shown to English-speaking shoppers; if you leave it blank, the main name above is used instead. Both are optional — a collection works with just a name. Gotcha: only one cover image is allowed (you can't add several), and these fields are just polish — not required to publish.