That...is not how TurboTax works.
Each time you file a return--every year--you need to download your completed, filed return when you finish filing that year's taxes. You actually need to download that file. Keeping it in the cloud online "seems" like it should work, but that's not actually how this service works, at all. They keep an archive, maybe 3 years? But it might cost a fee to access it.
Either way--for your business, YOU need to keep track of your business mileage. Every year. Maybe you have it on each year's return. Maybe you have it logged in a notebook or spreadsheet. But you need to keep that stuff. Asking the forum to give you that info 100% is not correct (because the forum users are more or like "regular social media". They aren't actually Intuit, the company that owns TurboTax.
So you'd need to call or DM Customer Support to talk to an agent. Not this user forum.
