"I did enter totals instead of reporting each separately"
that's why. it's an IRS rule when you report multiple transactions on a single line on form 8949 you're required to submit the details to the IRS. Since Turbotax doesn't allow attachments of PDFs and you would probably like to e-file using 8453 is the only option. However, you do have the option of mailing your return and manually attaching the 1099-B.
