No, you cannot upload or transfer a .tt24 file once you have already started and entered data into a 2025 return.
TurboTax is designed to "roll over" information from the previous year at the very beginning of the process. If you have already bypassed that step and started typing in your 2025 info, the software generally won't let you "merge" the two files later.
You don't necessarily have to "clear" everything, but you will need to start a new tax return file.
Go to the top menu and select File > New Tax Return.
The "Welcome" screen will appear. Click "Begin."
It should automatically search for your .tt24 file. If it doesn't find it, click "Browse" to locate it manually.
Thank you for choosing TurboTax.
