How to specify the main photo when adding products through the classmates api?

Question

Classmates

Hello!
When adding products using the market.add method ( https://apiok.ru/dev/methods/rest/market/market.add) , I preload several photos for the product, and pass a list of their IDs to the add method in the attachment field. But the photos in the product are eventually displayed in random order. In this case, any of the additional ones can appear in the place of the main photo. Is it possible to specify which photo should be the main one?
Sincerely