# Attach a document to a shopping cart (pack)

When the seller needs to add a document to a Mercado Libre shopping cart (pack), they must attach it to one of the individual orders in the cart. It can be attached to any order in the cart (there are no rules), but only to a single order.

Alephee will detect that the order to which the seller attached the document belongs to a Mercado Libre shopping cart (pack) and will upload it to the platform, associating it with the entire shopping cart (pack) instead of an individual order.\
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With this mechanism, they can upload a document to a shopping cart without additional development or the use of a specific API endpoint.

Remember to attach the document to only one (1) order in the cart. Any order, but only to one order.\
\ <mark style="color:$danger;">If the integration uploads documents to different individual orders in the same shopping cart (pack), the most recently uploaded document will overwrite any previously uploaded documents to the same shopping cart (pack).</mark>

To attach a document to an order, please refer to section [*Attach a document to an order*](https://developers.alephee.com/v2/orders/post-methods/attach-a-document-to-an-order).


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