No, attachments cannot be attached to an e-filed tax return when using TurboTax.
If you need to include an attachment to your tax return you will have to print and mail the return.
See this TurboTax support FAQ for how to print a tax return using the online editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-mail-return-turb...
