You need to log in to Online version from your laptop. After you transfer you can go back to the iPad app. The mobile app is just a portal to the Online version.
You can Transfer the prior year from the Desktop program into the current Online versions. You need to have the file ending in .tax2023 on your computer. So be sure you know where it is. But if you already started an online return you will have to clear it out and start over or set up a new online account. How to clear and start over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
How to transfer into Turbo Tax Online, including from a pdf file or other software or from the Desktop program
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
If you used the Desktop program before you may not like the Online version. It has less features and no Forms Mode. All the Online versions do not have the same forms so you may need to upgrade to a higher version. You can only do 1 return. Your return is only saved online so be sure to save both the .tax2024 data file and the pdf file to your computer when you are done. In case you need to amend in the future or if you need a copy to get a loan or something. You might not be able to access your online return when you need a copy.
