Hope you're doing great, fearlessone4832.
In QuickBooks Self-Employed, we only have one chance to send the data to TurboTax. This is the possible reason why the option to transfer the data disappeared since you've already attempted to send it.
The best option I can suggest is contacting our QuickBooks Self-Employed Support Team. They can import it again so you can prepare and file your taxes in TurboTax.
You'll want to check these guides to learn more about self-employment taxes:
QuickBooks Community is open 24/7 to assist you. Comment below if you have more clarifications.