Referring to single attachment in linked record


I’m maybe approaching this the wrong way but I’d like for customers to be able to upload multiple files as part of an order form and then have an easy way to break these into multiple order lines in a separate table.

Right now I have a separate table where I create multiple records linking back to the original order with a lookup field on the things that I want from the order but that leaves me with multiple attachments for both.

I could create a separate attachments field for the new order line table but I don’t see a good way for people to pick files that are already in Airtable rather than having to download them and then reupload them individually per record.

Am I approaching this wrong or is there a better way to do this?