I’ll post a request to support, but there should be a way to deal with this type of thing.
Just redeliver what you sent before and ask the buyer to contact you through the messaging system should they need anything else.
maybe the buyer does not understand what ask for modifications means, and by clicking it he meant that you should make modifications to make the delivery better, you should contact him and ask him what modifications he needs and if he clicked it by mistake, deliver again and ask him to click the “Review and complete” button
Agreed with emasonwrites that you should redeliver. It will be marked complete after 3 days, anyhow and you should be fine