How to make attachment on ASN lines mandatory in Supplier Portal conditionally

Hi

We have business requirement where the Suppliers are expected to add attachments on ASN line for items with certain attributes, for ex if the item has inspection required as Yes, we expect the supplier to attach the certification on the ASN lines.

Is there a way to customize the create ASN redwood page to make the attachment mandatory based on item attribute? Unless the attachments are added for such items the supplier should not be able to submit the ASN.

Thanks

Rajesh