Right now, when a customer submits a design for a quote, that design is locked. You can adjust pricing but you can't touch the actual design — which means if you spot an error, want to suggest an improvement, or need to tweak something before quoting, you're stuck.
Let store owners open a customer's submitted design, make edits, and save it as a new quote or send it back to the customer as a revised starting point.
This is common in custom product workflows. A customer submits something close but not quite right, and the seller needs to collaborate on getting it finalized before confirming the order.
The URL-based architecture already seems like it could support this. It would be a huge win for shops that do any kind of consultative selling or design assistance.