Glad to have you back, @BookPromotions.
That's a good question. In QuickBooks Self-Employed, you can only file the Schedule C from the previous year. Currently, there isn't a way to file or export a late filing.
Let me route you to our TurboTax Community so you can discuss it with them if there are other available options when filing a late Schedule C.
I'll be around if you have other questions. Take care and have a nice weekend.