I have a mileage report from DoorDash so I know exactly how many miles driven for business. But the program is asking for information I don't have - Total miles driven for all purposes, Commuting miles, or beginning an ending odometer readings. How can I claim my mileage expense?
You should estimate your total mileage for the year. It doesn't need to be perfect - the system is trying to figure out what percentage of the time you are using your car for business and what percentage for other things. You can do that estimate yourself.
If you figure you drive the car about half of the time for doordash then double the business miles and you're good. If you drive about 25% of the time for doordash multiply the business miles by 4 and you're good. Etc.