@Anonymous_ Actually, Turbotax claims it is supported. Under Investment Income, Stocks...Summary for this Account, you will see "To finish reporting these sales, follow the filing instructions." Click this link and you will see this:
...Here's how to file your statement(s):
If you are e-filing your tax return, you will need to attach a PDF copy of your 1099-B or broker statement(s) when you transmit your return. We will guide you through this process at that time.
Then you are never given the opportunity again to attach anything except for the 8453-FE. Very poor on Turbotax's part. From what I have read, I bet they removed the functionality but failed to remove the instructions.
