title: How to create a cart with file type modifier option via v3 cart API in BigCommerce?
body: <p>Can anyone please help me with how to create a cart with the file type modifier option of a product via V3 Cart API in BigCommerce?
  I've already followed the <a href="https://developer.bigcommerce.com/api-reference/20c2c55c1763f-create-a-cart" rel="nofollow noreferrer">Cart API Documentation</a>.
  Still, I'm not finding any solution to my issue.</p>
  <p>My product in store-front looks like the below image.</p>
  <p><a href="https://i.stack.imgur.com/J4lgW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J4lgW.png" alt="enter image description here" /></a></p>
  <p>Please help.</p>